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understanding our bodies and how they work. Physiology, as defined by the Oxford Dictionary, is \"the branch of biology that deals with the normal functions of living organisms and their parts.\" This field of study is distinct from anatomy, which focuses on the structure of the body, as physiology delves into the mechanisms that drive these structures.\n\nThe history of human physiology can be traced back to at least 420 BCE. The works of Aristotle, Hippocrates, and Galen, laid the foundation for Western physiology. Important discoveries by Jean Fernel, William Harvey, and Claude Bernard further advanced our understanding of the human body. \n\nFernel introduced the term “physiology”, Harvey was the first to describe system circulation, and Bernard laid the groundwork for homeostasis. The study of physiology is essential for understanding disease, sports science, physical therapy, and occupational therapy, as it provides insights into the underlying processes that govern our bodies.\n\n ![Graph](image://422b9f5b-853c-4d7c-be98-7c3685e81048 \" \")\n","46e582e9-d17e-4e94-b958-2a632fb8e906",[35],{"id":36,"data":37,"type":38,"version":20,"maxContentLevel":19},"41ce1007-dea5-4008-b38c-0f6567f76d0d",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":39,"multiChoiceCorrect":44,"multiChoiceIncorrect":46},11,[40,41,42,43],"What is the primary focus of human physiology?","What does human physiology mainly concentrate on?","In the study of human physiology, what aspects of living organisms are primarily examined?","What are the central aspects of living organisms that human physiology is concerned with?",[45],"Processes and functions of living organisms",[47,48,49],"Structure of the body","Genetic makeup","Evolutionary history",{"id":51,"data":52,"type":20,"maxContentLevel":19,"version":20,"reviews":56},"2263a8af-5702-45bf-b834-2da1237c3633",{"type":20,"title":53,"markdownContent":54,"audioMediaId":55},"Anatomical Terminology","Anatomical terminology is essential for accurately describing the human body and its structures. Regional and directional terms, such as anterior, posterior, medial, lateral, superior, inferior, proximal, distal, superficial, and deep, provide a universal language for discussing anatomy. \n\nThe three planes of the body - sagittal, frontal, and transverse - further aid in the precise description of body structures. The sagittal plane divides the body into left and right halves, separating it into two symmetrical sections. The frontal plane, also known as the coronal plane, divides the body into front and back sections.\n\n ![Graph](image://637c0a5e-f65e-4e94-b19a-061a6e60687f \"Planes of the body. Image: Connexions via Wikimedia\")\n\nThe transverse plane, also known as the horizontal plane, divides the body into top and bottom sections. The dorsal body cavity is located on the posterior (back) side and houses the cranial and spinal cavities. The ventral body cavity is located on the anterior (front) side and houses the thoracic and abdominopelvic cavities.\n\n ![Graph](image://ac35e391-e22b-40de-b2e9-d590d2d8fc5e \"Directional terms. Image: OpenStax College via Wikimedia\")","1770435e-f048-4b64-8813-4bb96c3833ad",[57],{"id":58,"data":59,"type":38,"version":20,"maxContentLevel":19},"1b8b3586-3e4a-4257-bc8c-0111883b9bb9",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":60,"multiChoiceCorrect":65,"multiChoiceIncorrect":67},[61,62,63,64],"Which plane divides the body into left and right halves?","Which anatomical plane separates the body into two symmetrical left and right sections?","In anatomical terminology, which plane is responsible for dividing the human body into left and right parts?","What is the name of the plane that splits the body into left and right halves in anatomy?",[66],"Sagittal plane",[68,69,70],"Frontal plane","Transverse plane","Coronal plane",{"id":72,"data":73,"type":20,"maxContentLevel":19,"version":20,"reviews":77},"5b72496c-8d42-448f-bbfc-e155361a09d8",{"type":20,"title":74,"markdownContent":75,"audioMediaId":76},"Body Cavities","Body cavities are essential for understanding human anatomy, as they house and protect our vital organs. Anatomy, as a field of study, focuses on the structure of the body. The major body cavities include the dorsal, ventral, spinal, cranial, thoracic, and abdominal cavities. Each cavity serves a specific function and is located in a particular region of the body.\n\nThe dorsal cavity, for example, contains the brain and spinal cord, while the ventral cavity houses organs such as the heart, lungs, and digestive system. The ventral cavity allows for the change in shape and size of organs based on their function. For example, the lungs, stomach, and uterus can all expand. Understanding the location and function of each body cavity is crucial for comprehending the organization of the human body and how its various systems interact.\n\n ![Graph](image://b2d4c005-9703-4c89-b595-f5d7b7845fa9 \"Body cavities. Image: Connexions via Wikimedia\")","a979d477-523f-4d34-9ea7-793e153bbb82",[78],{"id":79,"data":80,"type":38,"version":20,"maxContentLevel":19},"da4c2b1c-25a3-4cd2-8aa4-2f78eaca4c85",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":81,"multiChoiceCorrect":86,"multiChoiceIncorrect":88},[82,83,84,85],"Which body cavity contains the brain and spinal cord?","In which body cavity are the brain and spinal cord located?","The brain and spinal cord can be found in which body cavity?","Which cavity is responsible for housing the brain and spinal cord?",[87],"Dorsal cavity",[89,90,91],"Ventral cavity","Thoracic cavity","Abdominal cavity",{"id":93,"data":94,"type":25,"version":20,"maxContentLevel":19,"pages":96},"5c00c5ef-fedf-4c92-ad37-b73fb34e1916",{"type":25,"title":95},"Cellular and Tissue Physiology",[97,118,138],{"id":98,"data":99,"type":20,"maxContentLevel":19,"version":20,"reviews":103},"c86742fe-3c0c-4641-bcf2-362072023965",{"type":20,"title":100,"markdownContent":101,"audioMediaId":102},"Body Fluid Compartments","The distribution of water in the body is critical for maintaining fluid balance and overall health. The human body is composed of approximately 60% water, which is unevenly distributed across various organs and tissues. Organs such as the brain and kidneys require a higher water content to function optimally.\n\nIntracellular fluid (ICF) is the fluid within cells, while extracellular fluid (ECF) is the fluid outside of cells. These both play a vital role in body function, with imbalances leading to issues such as dehydration or overhydration. Dehydration occurs when the body loses more fluids than it takes in, leading to decreased fluid volume and increased concentrations of electrolytes in the ECF. \n\nOverhydration, on the other hand, occurs when the body takes in more fluids than it can eliminate, leading to increased fluid volume and decreased concentrations of electrolytes in the ECF. Electrolytes can also be affected by these imbalances. Electrolytes are substances that dissociate into ions (charged particles) when dissolved in a solution, such as water. They are essential for various physiological processes in the body, including regulating fluid balance, transmitting nerve impulses, and contracting muscles.\n\n ![Graph](image://1c2c0d70-0578-4518-9748-00508e1ca7d6 \"Fluid distribution in a male body. Image: Alan Sved and David Walsh via Wikimedia\")","acf17f8a-32ad-4895-843d-d3c41e84bcd5",[104],{"id":105,"data":106,"type":38,"version":20,"maxContentLevel":19},"eb75d32e-de82-4fca-9671-d6d0f21ed701",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":107,"multiChoiceCorrect":112,"multiChoiceIncorrect":114},[108,109,110,111],"What percentage of the human body is composed of water?","What proportion of water makes up the human body?","What is the approximate water content in the human body?","Around what percentage of water is found in the human body?",[113],"Approximately 60%",[115,116,117],"Approximately 40%","Approximately 80%","Approximately 50%",{"id":119,"data":120,"type":20,"maxContentLevel":19,"version":20,"reviews":124},"6d090f11-8f2b-4aae-9f09-a6b5c702d3a4",{"type":20,"title":121,"markdownContent":122,"audioMediaId":123},"Cellular Physiology","Cells are the basic building blocks of life. Cells are responsible for various processes, including metabolism, reproduction, communication, homeostasis, and differentiation (the process by which unspecialized cells develop into specialized cells with specific functions). The basic structure of a cell includes the cell membrane, nucleus, cytoplasm, organelles, and mitochondria. \n\nThe cell membrane, also known as the plasma membrane, is a thin, flexible layer that encloses the cell and separates its internal environment from the external environment. The nucleus is the control center and contains the cell's genetic material in the form of DNA. \n\nAn organelle is a specialized subunit within a cell that has a specific function. Mitochondria are organelles that produce energy for the cell through a process called cellular respiration. The cytoplasm is the gel-like substance that fills the cell and contains various organelles and structures.\n\nThere are over 200 different cell types in the human body, each with specific functions and locations. As cells age and die, they are replaced by new cells, with skin cells serving as a prime example of this process.\n\n ![Graph](image://9248d179-aee7-43be-a24e-c753b6dc18ee \"Differentiation of human cells. Image: Haileyfournier via Wikimedia\")","21652afd-64e9-4c34-92c0-7a55f4d17a94",[125],{"id":126,"data":127,"type":38,"version":20,"maxContentLevel":19},"d8eee504-73bf-4530-8609-8b2767578c3e",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":128,"multiChoiceCorrect":132,"multiChoiceIncorrect":134},[129,130,131],"What is the function of mitochondria?","What role do mitochondria play?","How do mitochondria contribute to a cell?",[133],"Produce energy for the cell through cellular respiration",[135,136,137],"Store genetic material","Protect the cell from external threats","Regulate cell temperature",{"id":139,"data":140,"type":20,"maxContentLevel":19,"version":20,"reviews":144},"8c739c65-6e9d-4296-9ff7-48f249246ebb",{"type":20,"title":141,"markdownContent":142,"audioMediaId":143},"Tissues","The human body is composed of four primary tissue types: epithelial, connective, muscle, and nervous. Each tissue type has a unique structure and function, and they work together to support the body's overall function. \n\nEpithelial tissue, for example, forms the outer layer of the skin and lines internal organs, while connective tissue (bone, blood, and lymph tissue) provides support and structure to various body parts. Skeletal muscle tissue is responsible for voluntary movement while smooth muscle tissue, like the muscles in your stomach, are involuntary. Nervous tissue is made up of nerve cells and transports “messages” around the body.\n\nUnderstanding the relationship between different tissue types and their functions is essential for comprehending the organization of the human body. For example, think of your body healing a wound. The epithelial tissue covers the wound, the connective tissue provides support and structure, the muscle tissue contracts to stop bleeding and prevent infection, and the nervous tissue coordinates the healing process.\n\n ![Graph](image://ba4edef6-85e2-46e8-9b22-0f77e3ce2944 \"The different types of tissues in your body. Image: OpenStax College via Wikimedia\")","66676023-4ee8-45f6-9b98-d4cf8176756e",[145],{"id":146,"data":147,"type":38,"version":20,"maxContentLevel":19},"421291c3-9336-4bff-83cc-49f4ae16c3cd",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":148,"multiChoiceCorrect":151,"multiChoiceIncorrect":153},[149,150],"What type of muscle tissue is responsible for voluntary movement?","Which muscle tissue allows us to control our movements voluntarily?",[152],"Skeletal muscle tissue",[154,155,156],"Smooth muscle tissue","Connective muscle tissue","Nervous muscle tissue",{"id":158,"data":159,"type":25,"version":20,"maxContentLevel":19,"pages":161},"f7d4a8a9-9bfd-4b5b-8426-eda590289c1b",{"type":25,"title":160},"Integration and Adaptation of Organ Systems",[162,183,200],{"id":163,"data":164,"type":20,"maxContentLevel":19,"version":20,"reviews":168},"e623cf71-2c2a-4343-adec-9ff3e84e5d90",{"type":20,"title":165,"markdownContent":166,"audioMediaId":167},"Organ Systems","The human body consists of 11 major organ systems. Each system serves a specific function and is composed of various organs that work together to maintain overall health. \n\nThe **circulatory system** is responsible for transporting blood, oxygen, and nutrients throughout the body, while the **respiratory system** facilitates gas exchange. \n\n ![Graph](image://c1c371af-8006-4798-86d5-bcbed1f9bbc1 \"A pair of lungs, part of the respiratory system. Image: Patrick J. Lynch via Wikimedia\")\n\nThe **integumentary system** (your body’s outer layer) provides protection from external factors, regulates body temperature, and synthesizes vitamin D. Meanwhile, the **lymphatic system** helps maintain fluid balance, filter pathogens from the blood, and produce immune cells. \n\nThe **endocrine system** regulates body functions through the secretion of hormones, and the **gastrointestinal system** breaks down food, absorbs nutrients, and eliminates waste. The **urinary system** filters waste products from the blood, regulates electrolyte balance and blood pressure, and produces urine. \n\nThe **muscoskeletal system** provides support and structure, facilitates movement, and protects internal organs. The **nervous system** coordinates and controls body functions, and processes and responds to sensory input. The **reproductive system** produces and transports gametes, facilitates fertilization and development of the fetus, and produces sex hormones. \n\nFinally, the **immune system** defends the body against pathogens and foreign substances, and plays a role in tissue repair and homeostasis.","bc703481-a098-4c03-bea0-96f71e417a6a",[169],{"id":170,"data":171,"type":38,"version":20,"maxContentLevel":19},"db1b2f04-5aad-4f72-bb21-687821b8c672",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":172,"multiChoiceCorrect":177,"multiChoiceIncorrect":179},[173,174,175,176],"What is the function of the circulatory system?","What role does the circulatory system play in the human body?","What is the primary purpose of the circulatory system?","What does the circulatory system do in terms of blood, oxygen, and nutrient distribution?",[178],"Transporting blood, oxygen, and nutrients throughout the body",[180,181,182],"Facilitating gas exchange","Regulating body temperature","Producing immune cells",{"id":184,"data":185,"type":20,"maxContentLevel":19,"version":20,"reviews":189},"a2fafd3f-3b2f-4566-909a-93b28c333c78",{"type":20,"title":186,"markdownContent":187,"audioMediaId":188},"Integration of Systems","The various organ systems in the human body work together to maintain homeostasis and ensure optimal function. For instance, the nervous and endocrine systems regulate the body's internal environment, while the circulatory and respiratory systems deliver oxygen and nutrients to tissues and remove waste products. \n\nFor example, during exercise, the musculoskeletal system produces movement by contracting skeletal muscles, which requires oxygen and energy. The respiratory system responds by increasing the rate and depth of breathing to supply the body with more oxygen and remove carbon dioxide. \n\nThe circulatory system works in conjunction with the respiratory system to deliver oxygen and nutrients to the working muscles and remove waste products. The endocrine system releases hormones such as adrenaline to increase heart rate and mobilize energy stores. The urinary system regulates electrolyte balance and removes waste products generated during exercise. The nervous system coordinates the movement and adjusts the breathing and heart rate based on the body's needs.\n\n ![Graph](image://d655a50d-4fdb-4eea-986f-e4af776e7964 \"A human heart, part of the circulatory system. Image: Patrick J. Lynch via Wikimedia\")","de33359d-7da4-4cc7-b6b0-49688d6c7410",[190],{"id":191,"data":192,"type":38,"version":20,"maxContentLevel":19},"a3a8a8c5-55d7-4c38-8db2-363269f3127c",{"type":38,"reviewType":20,"spacingBehaviour":20,"activeRecallQuestion":193,"activeRecallAnswers":198},[194,195,196,197],"Which system in the human body releases hormones such as adrenaline to increase heart rate and mobilize energy stores during exercise?","Which bodily system is responsible for producing hormones like adrenaline that raise heart rate and activate energy reserves?","During physical activity, which human body system is in charge of releasing hormones, including adrenaline, to boost heart rate and access stored energy?","When exercising, which system within the human body generates hormones such as adrenaline to elevate heart rate and tap into energy resources?",[199],"Endocrine system",{"id":201,"data":202,"type":20,"maxContentLevel":19,"version":20},"a2f36df5-ecce-4088-9dbd-afd7c31a888c",{"type":20,"title":203,"markdownContent":204,"audioMediaId":205},"Physiological Adaptations","The human body is capable of adapting to various environments and stressors, such as altitude, exercise, temperature, and internal and external stressors like bacterial and viral infections, air and water pollution, and dietary imbalances. These adaptations can manifest as genetic changes, developmental adjustments, or acclimatization.\n\n ![Graph](image://4032aac0-7eca-412f-833d-549f5e784c70 \" \")\n\nFor example, individuals living at high altitudes may develop increased red blood cell production to compensate for lower oxygen levels, while those exposed to extreme temperatures may undergo changes in their metabolic rates to maintain body temperature. Understanding these physiological adaptations is essential for appreciating the resilience and adaptability of the human body in the face of diverse challenges.\n","7c282659-276d-4584-a754-25c11ed75c57",[207,309,406],{"id":23,"data":24,"type":25,"version":20,"maxContentLevel":19,"pages":208},[209,246,284],{"id":29,"data":30,"type":20,"maxContentLevel":19,"version":20,"reviews":34,"parsed":210},{"data":211,"body":214,"toc":244},{"title":212,"description":213},"","Human physiology is the study of the processes and functions that make us tick, and it is a critical component of understanding our bodies and how they work. Physiology, as defined by the Oxford Dictionary, is \"the branch of biology that deals with the normal functions of living organisms and their parts.\" This field of study is distinct from anatomy, which focuses on the structure of the body, as physiology delves into the mechanisms that drive these structures.",{"type":215,"children":216},"root",[217,224,229,234],{"type":218,"tag":219,"props":220,"children":221},"element","p",{},[222],{"type":223,"value":213},"text",{"type":218,"tag":219,"props":225,"children":226},{},[227],{"type":223,"value":228},"The history of human physiology can be traced back to at least 420 BCE. The works of Aristotle, Hippocrates, and Galen, laid the foundation for Western physiology. Important discoveries by Jean Fernel, William Harvey, and Claude Bernard further advanced our understanding of the human body.",{"type":218,"tag":219,"props":230,"children":231},{},[232],{"type":223,"value":233},"Fernel introduced the term “physiology”, Harvey was the first to describe system circulation, and Bernard laid the groundwork for homeostasis. The study of physiology is essential for understanding disease, sports science, physical therapy, and occupational therapy, as it provides insights into the underlying processes that govern our bodies.",{"type":218,"tag":219,"props":235,"children":236},{},[237],{"type":218,"tag":238,"props":239,"children":243},"img",{"alt":240,"src":241,"title":242},"Graph","image://422b9f5b-853c-4d7c-be98-7c3685e81048"," ",[],{"title":212,"searchDepth":25,"depth":25,"links":245},[],{"id":51,"data":52,"type":20,"maxContentLevel":19,"version":20,"reviews":56,"parsed":247},{"data":248,"body":250,"toc":282},{"title":212,"description":249},"Anatomical terminology is essential for accurately describing the human body and its structures. Regional and directional terms, such as anterior, posterior, medial, lateral, superior, inferior, proximal, distal, superficial, and deep, provide a universal language for discussing anatomy.",{"type":215,"children":251},[252,256,261,269,274],{"type":218,"tag":219,"props":253,"children":254},{},[255],{"type":223,"value":249},{"type":218,"tag":219,"props":257,"children":258},{},[259],{"type":223,"value":260},"The three planes of the body - sagittal, frontal, and transverse - further aid in the precise description of body structures. The sagittal plane divides the body into left and right halves, separating it into two symmetrical sections. The frontal plane, also known as the coronal plane, divides the body into front and back sections.",{"type":218,"tag":219,"props":262,"children":263},{},[264],{"type":218,"tag":238,"props":265,"children":268},{"alt":240,"src":266,"title":267},"image://637c0a5e-f65e-4e94-b19a-061a6e60687f","Planes of the body. Image: Connexions via Wikimedia",[],{"type":218,"tag":219,"props":270,"children":271},{},[272],{"type":223,"value":273},"The transverse plane, also known as the horizontal plane, divides the body into top and bottom sections. The dorsal body cavity is located on the posterior (back) side and houses the cranial and spinal cavities. The ventral body cavity is located on the anterior (front) side and houses the thoracic and abdominopelvic cavities.",{"type":218,"tag":219,"props":275,"children":276},{},[277],{"type":218,"tag":238,"props":278,"children":281},{"alt":240,"src":279,"title":280},"image://ac35e391-e22b-40de-b2e9-d590d2d8fc5e","Directional terms. Image: OpenStax College via Wikimedia",[],{"title":212,"searchDepth":25,"depth":25,"links":283},[],{"id":72,"data":73,"type":20,"maxContentLevel":19,"version":20,"reviews":77,"parsed":285},{"data":286,"body":288,"toc":307},{"title":212,"description":287},"Body cavities are essential for understanding human anatomy, as they house and protect our vital organs. Anatomy, as a field of study, focuses on the structure of the body. The major body cavities include the dorsal, ventral, spinal, cranial, thoracic, and abdominal cavities. Each cavity serves a specific function and is located in a particular region of the body.",{"type":215,"children":289},[290,294,299],{"type":218,"tag":219,"props":291,"children":292},{},[293],{"type":223,"value":287},{"type":218,"tag":219,"props":295,"children":296},{},[297],{"type":223,"value":298},"The dorsal cavity, for example, contains the brain and spinal cord, while the ventral cavity houses organs such as the heart, lungs, and digestive system. The ventral cavity allows for the change in shape and size of organs based on their function. For example, the lungs, stomach, and uterus can all expand. Understanding the location and function of each body cavity is crucial for comprehending the organization of the human body and how its various systems interact.",{"type":218,"tag":219,"props":300,"children":301},{},[302],{"type":218,"tag":238,"props":303,"children":306},{"alt":240,"src":304,"title":305},"image://b2d4c005-9703-4c89-b595-f5d7b7845fa9","Body cavities. Image: Connexions via Wikimedia",[],{"title":212,"searchDepth":25,"depth":25,"links":308},[],{"id":93,"data":94,"type":25,"version":20,"maxContentLevel":19,"pages":310},[311,341,376],{"id":98,"data":99,"type":20,"maxContentLevel":19,"version":20,"reviews":103,"parsed":312},{"data":313,"body":315,"toc":339},{"title":212,"description":314},"The distribution of water in the body is critical for maintaining fluid balance and overall health. The human body is composed of approximately 60% water, which is unevenly distributed across various organs and tissues. Organs such as the brain and kidneys require a higher water content to function optimally.",{"type":215,"children":316},[317,321,326,331],{"type":218,"tag":219,"props":318,"children":319},{},[320],{"type":223,"value":314},{"type":218,"tag":219,"props":322,"children":323},{},[324],{"type":223,"value":325},"Intracellular fluid (ICF) is the fluid within cells, while extracellular fluid (ECF) is the fluid outside of cells. These both play a vital role in body function, with imbalances leading to issues such as dehydration or overhydration. Dehydration occurs when the body loses more fluids than it takes in, leading to decreased fluid volume and increased concentrations of electrolytes in the ECF.",{"type":218,"tag":219,"props":327,"children":328},{},[329],{"type":223,"value":330},"Overhydration, on the other hand, occurs when the body takes in more fluids than it can eliminate, leading to increased fluid volume and decreased concentrations of electrolytes in the ECF. Electrolytes can also be affected by these imbalances. Electrolytes are substances that dissociate into ions (charged particles) when dissolved in a solution, such as water. They are essential for various physiological processes in the body, including regulating fluid balance, transmitting nerve impulses, and contracting muscles.",{"type":218,"tag":219,"props":332,"children":333},{},[334],{"type":218,"tag":238,"props":335,"children":338},{"alt":240,"src":336,"title":337},"image://1c2c0d70-0578-4518-9748-00508e1ca7d6","Fluid distribution in a male body. Image: Alan Sved and David Walsh via Wikimedia",[],{"title":212,"searchDepth":25,"depth":25,"links":340},[],{"id":119,"data":120,"type":20,"maxContentLevel":19,"version":20,"reviews":124,"parsed":342},{"data":343,"body":345,"toc":374},{"title":212,"description":344},"Cells are the basic building blocks of life. Cells are responsible for various processes, including metabolism, reproduction, communication, homeostasis, and differentiation (the process by which unspecialized cells develop into specialized cells with specific functions). The basic structure of a cell includes the cell membrane, nucleus, cytoplasm, organelles, and mitochondria.",{"type":215,"children":346},[347,351,356,361,366],{"type":218,"tag":219,"props":348,"children":349},{},[350],{"type":223,"value":344},{"type":218,"tag":219,"props":352,"children":353},{},[354],{"type":223,"value":355},"The cell membrane, also known as the plasma membrane, is a thin, flexible layer that encloses the cell and separates its internal environment from the external environment. The nucleus is the control center and contains the cell's genetic material in the form of DNA.",{"type":218,"tag":219,"props":357,"children":358},{},[359],{"type":223,"value":360},"An organelle is a specialized subunit within a cell that has a specific function. Mitochondria are organelles that produce energy for the cell through a process called cellular respiration. The cytoplasm is the gel-like substance that fills the cell and contains various organelles and structures.",{"type":218,"tag":219,"props":362,"children":363},{},[364],{"type":223,"value":365},"There are over 200 different cell types in the human body, each with specific functions and locations. As cells age and die, they are replaced by new cells, with skin cells serving as a prime example of this process.",{"type":218,"tag":219,"props":367,"children":368},{},[369],{"type":218,"tag":238,"props":370,"children":373},{"alt":240,"src":371,"title":372},"image://9248d179-aee7-43be-a24e-c753b6dc18ee","Differentiation of human cells. Image: Haileyfournier via Wikimedia",[],{"title":212,"searchDepth":25,"depth":25,"links":375},[],{"id":139,"data":140,"type":20,"maxContentLevel":19,"version":20,"reviews":144,"parsed":377},{"data":378,"body":380,"toc":404},{"title":212,"description":379},"The human body is composed of four primary tissue types: epithelial, connective, muscle, and nervous. Each tissue type has a unique structure and function, and they work together to support the body's overall function.",{"type":215,"children":381},[382,386,391,396],{"type":218,"tag":219,"props":383,"children":384},{},[385],{"type":223,"value":379},{"type":218,"tag":219,"props":387,"children":388},{},[389],{"type":223,"value":390},"Epithelial tissue, for example, forms the outer layer of the skin and lines internal organs, while connective tissue (bone, blood, and lymph tissue) provides support and structure to various body parts. Skeletal muscle tissue is responsible for voluntary movement while smooth muscle tissue, like the muscles in your stomach, are involuntary. Nervous tissue is made up of nerve cells and transports “messages” around the body.",{"type":218,"tag":219,"props":392,"children":393},{},[394],{"type":223,"value":395},"Understanding the relationship between different tissue types and their functions is essential for comprehending the organization of the human body. For example, think of your body healing a wound. The epithelial tissue covers the wound, the connective tissue provides support and structure, the muscle tissue contracts to stop bleeding and prevent infection, and the nervous tissue coordinates the healing process.",{"type":218,"tag":219,"props":397,"children":398},{},[399],{"type":218,"tag":238,"props":400,"children":403},{"alt":240,"src":401,"title":402},"image://ba4edef6-85e2-46e8-9b22-0f77e3ce2944","The different types of tissues in your body. Image: OpenStax College via Wikimedia",[],{"title":212,"searchDepth":25,"depth":25,"links":405},[],{"id":158,"data":159,"type":25,"version":20,"maxContentLevel":19,"pages":407},[408,528,558],{"id":163,"data":164,"type":20,"maxContentLevel":19,"version":20,"reviews":168,"parsed":409},{"data":410,"body":412,"toc":526},{"title":212,"description":411},"The human body consists of 11 major organ systems. Each system serves a specific function and is composed of various organs that work together to maintain overall health.",{"type":215,"children":413},[414,418,438,446,464,489,514],{"type":218,"tag":219,"props":415,"children":416},{},[417],{"type":223,"value":411},{"type":218,"tag":219,"props":419,"children":420},{},[421,423,429,431,436],{"type":223,"value":422},"The ",{"type":218,"tag":424,"props":425,"children":426},"strong",{},[427],{"type":223,"value":428},"circulatory system",{"type":223,"value":430}," is responsible for transporting blood, oxygen, and nutrients throughout the body, while the ",{"type":218,"tag":424,"props":432,"children":433},{},[434],{"type":223,"value":435},"respiratory system",{"type":223,"value":437}," facilitates gas exchange.",{"type":218,"tag":219,"props":439,"children":440},{},[441],{"type":218,"tag":238,"props":442,"children":445},{"alt":240,"src":443,"title":444},"image://c1c371af-8006-4798-86d5-bcbed1f9bbc1","A pair of lungs, part of the respiratory system. Image: Patrick J. Lynch via Wikimedia",[],{"type":218,"tag":219,"props":447,"children":448},{},[449,450,455,457,462],{"type":223,"value":422},{"type":218,"tag":424,"props":451,"children":452},{},[453],{"type":223,"value":454},"integumentary system",{"type":223,"value":456}," (your body’s outer layer) provides protection from external factors, regulates body temperature, and synthesizes vitamin D. Meanwhile, the ",{"type":218,"tag":424,"props":458,"children":459},{},[460],{"type":223,"value":461},"lymphatic system",{"type":223,"value":463}," helps maintain fluid balance, filter pathogens from the blood, and produce immune cells.",{"type":218,"tag":219,"props":465,"children":466},{},[467,468,473,475,480,482,487],{"type":223,"value":422},{"type":218,"tag":424,"props":469,"children":470},{},[471],{"type":223,"value":472},"endocrine system",{"type":223,"value":474}," regulates body functions through the secretion of hormones, and the ",{"type":218,"tag":424,"props":476,"children":477},{},[478],{"type":223,"value":479},"gastrointestinal system",{"type":223,"value":481}," breaks down food, absorbs nutrients, and eliminates waste. The ",{"type":218,"tag":424,"props":483,"children":484},{},[485],{"type":223,"value":486},"urinary system",{"type":223,"value":488}," filters waste products from the blood, regulates electrolyte balance and blood pressure, and produces urine.",{"type":218,"tag":219,"props":490,"children":491},{},[492,493,498,500,505,507,512],{"type":223,"value":422},{"type":218,"tag":424,"props":494,"children":495},{},[496],{"type":223,"value":497},"muscoskeletal system",{"type":223,"value":499}," provides support and structure, facilitates movement, and protects internal organs. The ",{"type":218,"tag":424,"props":501,"children":502},{},[503],{"type":223,"value":504},"nervous system",{"type":223,"value":506}," coordinates and controls body functions, and processes and responds to sensory input. The ",{"type":218,"tag":424,"props":508,"children":509},{},[510],{"type":223,"value":511},"reproductive system",{"type":223,"value":513}," produces and transports gametes, facilitates fertilization and development of the fetus, and produces sex hormones.",{"type":218,"tag":219,"props":515,"children":516},{},[517,519,524],{"type":223,"value":518},"Finally, the ",{"type":218,"tag":424,"props":520,"children":521},{},[522],{"type":223,"value":523},"immune system",{"type":223,"value":525}," defends the body against pathogens and foreign substances, and plays a role in tissue repair and homeostasis.",{"title":212,"searchDepth":25,"depth":25,"links":527},[],{"id":184,"data":185,"type":20,"maxContentLevel":19,"version":20,"reviews":189,"parsed":529},{"data":530,"body":532,"toc":556},{"title":212,"description":531},"The various organ systems in the human body work together to maintain homeostasis and ensure optimal function. For instance, the nervous and endocrine systems regulate the body's internal environment, while the circulatory and respiratory systems deliver oxygen and nutrients to tissues and remove waste products.",{"type":215,"children":533},[534,538,543,548],{"type":218,"tag":219,"props":535,"children":536},{},[537],{"type":223,"value":531},{"type":218,"tag":219,"props":539,"children":540},{},[541],{"type":223,"value":542},"For example, during exercise, the musculoskeletal system produces movement by contracting skeletal muscles, which requires oxygen and energy. The respiratory system responds by increasing the rate and depth of breathing to supply the body with more oxygen and remove carbon dioxide.",{"type":218,"tag":219,"props":544,"children":545},{},[546],{"type":223,"value":547},"The circulatory system works in conjunction with the respiratory system to deliver oxygen and nutrients to the working muscles and remove waste products. The endocrine system releases hormones such as adrenaline to increase heart rate and mobilize energy stores. The urinary system regulates electrolyte balance and removes waste products generated during exercise. The nervous system coordinates the movement and adjusts the breathing and heart rate based on the body's needs.",{"type":218,"tag":219,"props":549,"children":550},{},[551],{"type":218,"tag":238,"props":552,"children":555},{"alt":240,"src":553,"title":554},"image://d655a50d-4fdb-4eea-986f-e4af776e7964","A human heart, part of the circulatory system. Image: Patrick J. Lynch via Wikimedia",[],{"title":212,"searchDepth":25,"depth":25,"links":557},[],{"id":201,"data":202,"type":20,"maxContentLevel":19,"version":20,"parsed":559},{"data":560,"body":562,"toc":580},{"title":212,"description":561},"The human body is capable of adapting to various environments and stressors, such as altitude, exercise, temperature, and internal and external stressors like bacterial and viral infections, air and water pollution, and dietary imbalances. These adaptations can manifest as genetic changes, developmental adjustments, or acclimatization.",{"type":215,"children":563},[564,568,575],{"type":218,"tag":219,"props":565,"children":566},{},[567],{"type":223,"value":561},{"type":218,"tag":219,"props":569,"children":570},{},[571],{"type":218,"tag":238,"props":572,"children":574},{"alt":240,"src":573,"title":242},"image://4032aac0-7eca-412f-833d-549f5e784c70",[],{"type":218,"tag":219,"props":576,"children":577},{},[578],{"type":223,"value":579},"For example, individuals living at high altitudes may develop increased red blood cell production to compensate for lower oxygen levels, while those exposed to extreme temperatures may undergo changes in their metabolic rates to maintain body temperature. Understanding these physiological adaptations is essential for appreciating the resilience and adaptability of the human body in the face of diverse challenges.",{"title":212,"searchDepth":25,"depth":25,"links":581},[],{"left":4,"top":4,"width":583,"height":583,"rotate":4,"vFlip":6,"hFlip":6,"body":584},24,"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"m9 18l6-6l-6-6\"/>",{"left":4,"top":4,"width":583,"height":583,"rotate":4,"vFlip":6,"hFlip":6,"body":586},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 5h16M4 12h16M4 19h16\"/>",1778179388686]