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physiology, as it provides the framework and machinery for movement, support, and protection. \n\n ![Graph](image://f8e45c6a-a93d-4986-821c-4cf8735b4773 \" \")\n\nComprised of bones, muscles, tendons, ligaments, and joints, this system works in harmony to enable a wide range of physical activities. From the delicate movements of a pianist's fingers to the powerful strides of an Olympic sprinter, the musculoskeletal system is essential for our daily lives and overall well-being.\n\n ![Graph](image://548c2946-e43b-47e3-b1e7-80b234fab4fe \"The musculoskeletal system.\")","d015f9cb-3714-41a7-bf07-4c86f3afa6da",[35],{"id":36,"data":37,"type":38,"version":20,"maxContentLevel":19},"469b7377-55a6-4358-b867-988900770f36",{"type":38,"reviewType":20,"spacingBehaviour":20,"activeRecallQuestion":39,"activeRecallAnswers":44},11,[40,41,42,43],"What system in human physiology provides the framework and machinery for movement, support, and protection?","Which human physiological system is responsible for enabling movement, support, and protection in our bodies?","What is the name of the system in our body that allows us to move, provides support, and offers protection?","In human physiology, which system plays a crucial role in facilitating movement, ensuring support, and safeguarding our bodies?",[45],"Musculoskeletal system",{"id":47,"data":48,"type":20,"maxContentLevel":19,"version":20,"reviews":52},"801daf93-56a5-45b9-8326-810862cb9c21",{"type":20,"title":49,"markdownContent":50,"audioMediaId":51},"Muscle Tissue","Building upon the foundation of the musculoskeletal system, muscle tissue plays a crucial role in facilitating movement. There are three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle, which is attached to bones by tendons, is responsible for voluntary movements and is characterized by its striated appearance. \n\nSmooth muscle, found in the walls of internal organs, controls involuntary movements such as digestion and blood vessel constriction. Cardiac muscle, exclusive to the heart, is responsible for pumping blood throughout the body. Each type of muscle tissue has a unique structure and function, working together to support the body's diverse range of activities.\n\n ![Graph](image://e6086768-2e6d-4b25-9821-fd4b313e2dc3 \"The different types of muscle tissue: smooth, cardiac, skeletal. Image: www.scientificanimations.com via Wikimedia\")","5e17b9fa-0b3c-4756-acd4-e65d6b0d983e",[53],{"id":54,"data":55,"type":38,"version":20,"maxContentLevel":19},"0cf560af-e293-4fdd-aeec-b9787f660361",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":56,"binaryCorrect":61,"binaryIncorrect":63},[57,58,59,60],"How many types of muscle tissue are there?","What is the total number of muscle tissue varieties?","In how many categories can muscle tissue be classified?","How many distinct muscle tissue types exist?",[62],"Three",[64],"Two",{"id":66,"data":67,"type":20,"maxContentLevel":19,"version":20,"reviews":71},"da88b728-e806-4d31-8f0d-a9c1c9ad1435",{"type":20,"title":68,"markdownContent":69,"audioMediaId":70},"Muscle Contraction","Muscle contraction is the process by which muscles generate force to produce movement. The sliding filament theory explains this process, stating that the overlapping actin and myosin filaments within muscle fibers slide past one another, shortening the muscle and generating force. \n\n ![Graph](image://d7dc5347-60f4-4b0f-b293-e8af33f29920 \"Muscle contraction on a cellular level. Image: OpenStax via Wikimedia\")\n\nExcitation-contraction coupling is the sequence of events that links the electrical signal from a nerve to the actual muscle contraction. For example, when you lift a cup of coffee, your brain sends an electrical signal to the appropriate muscles, triggering the release of calcium ions and initiating the sliding filament process, ultimately resulting in muscle contraction and movement.\n\n ![Graph](image://1e09bb0f-1876-4d82-8c96-903c3c1407f4 \"Muscle contraction on a larger scale. Image: OpenStax via Wikimedia\")","b2e65815-f00c-476b-b42f-e68a12110932",[72],{"id":73,"data":74,"type":38,"version":20,"maxContentLevel":19},"627cb0d5-199a-4111-a0ca-197a804d65db",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":75,"multiChoiceCorrect":80,"multiChoiceIncorrect":82},[76,77,78,79],"What is the process by which muscles generate force?","How do muscles create force to produce movement?","What mechanism allows muscles to produce force for movement?","Through which process do muscles generate the force needed for movement?",[81],"Muscle contraction",[83,84,85],"Muscle relaxation","Muscle elongation","Muscle stiffness",{"id":87,"data":88,"type":20,"maxContentLevel":19,"version":20,"reviews":92},"351d0b19-2c26-4234-9856-f5e6f30b3d37",{"type":20,"title":89,"markdownContent":90,"audioMediaId":91},"Muscle Metabolism","Muscle metabolism is the process by which muscles obtain and utilize energy for contraction. There are three primary energy sources for muscle metabolism: adenosine triphosphate (ATP), creatine phosphate, and glycogen. ATP is the immediate source of energy for muscle contraction, while creatine phosphate and glycogen serve as energy reserves that can be rapidly converted to ATP when needed. \n\nMuscles rely on different metabolic pathways, such as aerobic respiration (the process by which cells use oxygen to convert glucose into energy in the form of ATP) and anaerobic glycolysis (the process by which cells break down glucose into energy in the absence of oxygen) depending on the intensity and duration of the activity. \n\nFor instance, during a sprint, muscles might start with aerobic respiration, but quickly switch to anaerobic glycolysis, which is better at providing quicker bursts of energy. On the other hand, during a long-distance run, aerobic respiration will provide a more sustained energy supply.","939b6b82-1b71-43ce-b4b1-b41ed5daf6fb",[93],{"id":94,"data":95,"type":38,"version":20,"maxContentLevel":19},"6b46838b-6fe0-4d8d-be6a-c4a1b241977c",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":96,"multiChoiceCorrect":99,"multiChoiceIncorrect":101},[97,98],"Which metabolic pathway is better at producing quick bursts of energy?","What is the most suitable energy pathway for producing quick bursts of energy?",[100],"Anaerobic glycolysis",[102,103,104],"Aerobic respiration","Oxidative phosphorylation","Beta-oxidation",{"id":106,"data":107,"type":20,"maxContentLevel":19,"version":20,"reviews":111},"b400bb0c-4ec7-4dfc-951b-ba3e9834f4b2",{"type":20,"title":108,"markdownContent":109,"audioMediaId":110},"Muscle Fatigue","Muscle fatigue is the decline in muscle performance and force generation due to prolonged or intense activity. An example of muscle fatigue is the burning sensation and weakness experienced during a challenging workout. There are two types of muscle fatigue: peripheral and central. \n\nPeripheral fatigue occurs within the muscle itself, often due to the accumulation of metabolic byproducts, depletion of energy reserves, and impaired excitation-contraction coupling. Central fatigue, on the other hand, originates in the central nervous system and involves a decrease in the neural drive to the muscles. \n\nMuscle fatigue can be acute or chronic, and can affect athletes, individuals with certain medical conditions, and those who engage in prolonged or intense physical activity. It can be managed through adequate rest and recovery, proper nutrition, and regular exercise.\n\n ![Graph](image://f5b9aaec-09d7-40b6-9847-6046c4d5fcdb \" \")\n","d73050c9-611b-40f0-a3f8-b874a2cb9ddc",[112],{"id":113,"data":114,"type":38,"version":20,"maxContentLevel":19},"a9712335-f928-430a-8aea-e812dbf52901",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":115,"multiChoiceCorrect":118,"multiChoiceIncorrect":120},[116,117],"What are the two types of muscle fatigue?","Can you name the two kinds of muscle fatigue?",[119],"Peripheral and central",[121,122,123],"Under and over","External and internal","Upper and lower",{"id":125,"data":126,"type":25,"version":20,"maxContentLevel":19,"pages":128},"fea82f92-ccdf-4c74-874b-3b3f3d89f2c9",{"type":25,"title":127},"Components of the Skeletal System",[129,150,169],{"id":130,"data":131,"type":20,"maxContentLevel":19,"version":20,"reviews":135},"732de7a9-df37-4afe-856a-8734bdbb136f",{"type":20,"title":132,"markdownContent":133,"audioMediaId":134},"Bone Tissue","Bone tissue is a dynamic and complex structure that provides support, protection, and mineral storage for the body. Composed of organic components, such as collagen fibers, and inorganic minerals, such as calcium and phosphate, bone tissue is both strong and flexible. Bone tissue is made up of two main types of bone: cortical bone and trabecular bone. Cortical bone is dense and compact, while trabecular bone is less dense and has a spongy, honeycomb-like structure. Both types of bone are made up of osteoblasts, osteocytes, and osteoclasts. Osteoblasts are bone-forming cells that are responsible for the synthesis and deposition of the organic matrix of bone tissue. \n\n ![Graph](image://5c6deead-9bbb-47d9-89c4-a7d3172ef3a6 \"Anatomy of a bone. Image: Pbroks13 via Wikimedia\")\n\nOsteocytes are mature bone cells that are embedded in the mineralized matrix and maintain the bone tissue. Osteoclasts are large, multinucleated cells that are responsible for the breakdown and resorption of bone tissue. Bone remodeling, the continuous process of bone formation and resorption, allows the skeleton to adapt to mechanical stress and maintain overall bone health. Interestingly, bones are capable of self-repair, as demonstrated by the healing of fractures through the formation of new bone tissue.\n\n ![Graph](image://603e79ca-d1f0-4053-8706-6bdf2e8b0a78 \"Different types of bone cells. Image: OpenStax College via Wikimedia\")","1a5a3125-1a5a-4abf-90e5-4dc15f1d2532",[136],{"id":137,"data":138,"type":38,"version":20,"maxContentLevel":19},"df36e6c4-10b8-4d51-98f5-9d761fb1d7b9",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":139,"multiChoiceCorrect":144,"multiChoiceIncorrect":146},[140,141,142,143],"Which two main types of bone make up bone tissue?","What are the two primary categories of bone found in bone tissue?","Name the two main kinds of bone that constitute bone tissue","Identify the two major types of bone that form bone tissue",[145],"Cortical bone and trabecular bone",[147,148,149],"Compact bone and spongy bone","Dense bone and porous bone","Hard bone and soft bone",{"id":151,"data":152,"type":20,"maxContentLevel":19,"version":20,"reviews":156},"3c652af7-5b51-4d82-a53a-2dd1b484c171",{"type":20,"title":153,"markdownContent":154,"audioMediaId":155},"Skeletal System","The human skeletal system is composed of 206 bones, which are divided into two main categories: axial and appendicular. They provide the framework for the body and supports the musculoskeletal system's functions. The axial skeleton, which includes the skull, vertebral column, and rib cage, protects vital organs and maintains the body's central structure. The appendicular skeleton, comprising the limbs and girdles, facilitates movement and interaction with the environment. \n\n ![Graph](image://fb8c2348-6ef0-4b0a-bb4d-88462ff5a37d \"The skeletal system, with the axial and appendicular bones labeled. Image: OpenStax Anatomy and Physiology via Wikimedia\")\n\nLigaments are fibrous tissues that connect bones to other bones, providing stability to the joints. They are important for maintaining joint integrity and preventing injury. The skeletal system also includes several other structures, such as tendons, which attach muscles to bones, and bursae, which are fluid-filled sacs that reduce friction between bones, tendons, and muscles.\n\n ![Graph](image://7710bc92-280c-4e1f-bf93-12f0adf815ef \"A ligament. Image: www.scientificanimations.com via Wikimedia\")\n\nTogether, these two components form a dynamic and adaptable system that enables a wide range of physical activities and functions.","69540072-8dad-410a-a1dc-eb89eaff1f14",[157],{"id":158,"data":159,"type":38,"version":20,"maxContentLevel":19},"a935605a-7582-42c3-8160-c2d9d28d3d25",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":160,"binaryCorrect":165,"binaryIncorrect":167},[161,162,163,164],"How many bones are in the human skeletal system?","What is the total number of bones in the human body?","How many bones make up the human skeleton?","In the human body, what is the count of bones present in the skeletal system?",[166],"206",[168],"198",{"id":170,"data":171,"type":20,"maxContentLevel":19,"version":20,"reviews":175},"52ed27c2-21bb-406d-a98e-25dcb462eec0",{"type":20,"title":172,"markdownContent":173,"audioMediaId":174},"Joints","Joints are the points of connection between bones, allowing for movement and providing stability. They are classified into three categories: fibrous, cartilaginous, and synovial joints. Fibrous joints, such as the sutures in the skull, are immovable and held together by dense connective tissue. Cartilaginous joints, like the intervertebral discs, permit limited movement and are connected by cartilage. \n\nThe most common type of joint is the synovial joint, which is found in the majority of the body's joints, including the knees, hips, and shoulders. They allow for a wide range of motion and are characterized by a fluid-filled joint cavity surrounded by a fibrous capsule. There are several different types of synovial joints, including hinge joints, ball-and-socket joints, and pivot joints. Each type of joint contributes to the overall flexibility and stability of the musculoskeletal system.\n\n ![Graph](image://265b82b7-dcde-488e-bbfd-d0d59433e8fc \"The three categories of joints: cartilaginous, fibrous, synovial. Image: www.scientificanimations.com via Wikimedia\")","76ef9681-b2ba-41f0-8015-7ca88c029f54",[176],{"id":177,"data":178,"type":38,"version":20,"maxContentLevel":19},"d759151f-68f1-4e4e-8c17-119063ecb7dd",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":179,"multiChoiceCorrect":184,"multiChoiceIncorrect":186},[180,181,182,183],"Which type of joint allows for a wide range of motion?","Which joint category provides a broad range of movement?","What kind of joint offers extensive flexibility?","In which type of joint can you find a high degree of motion?",[185],"Synovial joint",[187,188,189],"Fibrous joint","Cartilaginous joint","Hinge joint",{"id":191,"data":192,"type":25,"version":20,"maxContentLevel":19,"pages":194},"80175d8d-bb64-4595-a8c5-1a2d3f4dd8b8",{"type":25,"title":193},"Musculoskeletal Health and Disorders",[195,214],{"id":196,"data":197,"type":20,"maxContentLevel":19,"version":20,"reviews":201},"f276beaa-fc59-405e-be5a-4cba5b2204f8",{"type":20,"title":198,"markdownContent":199,"audioMediaId":200},"Musculoskeletal Disorders","Musculoskeletal disorders encompass a variety of conditions that affect the bones, muscles, and joints, often causing pain and reduced mobility. Osteoporosis, a disorder characterized by decreased bone density and increased fracture risk, is a common example that primarily affects older adults, particularly postmenopausal women. \n\n ![Graph](image://69e3ec5e-6bcc-4bf2-8c82-eff0c9d5a7f4 \"Osteoporosis. Image: Laboratoires Servier via Wikimedia\")\n\nOsteoarthritis is a degenerative joint disease that occurs when the protective cartilage that cushions the ends of bones wears down over time, causing pain, stiffness, and loss of function. Rheumatoid arthritis is an autoimmune disorder that causes inflammation in the joints, leading to pain, stiffness, and deformity. Carpal tunnel syndrome is a condition in which the median nerve in the wrist becomes compressed, causing pain, numbness, and weakness in the hand and arm.\n\n ![Graph](image://9d957f2c-62ae-4746-b191-9456a38e7dee \"Osteoarthritis and rheumatoid arthritis. Image: Laboratoires Servier via Wikimedia\")\n\nEarly diagnosis and appropriate treatment of these conditions are essential for maintaining overall musculoskeletal health and quality of life.","a85787aa-1185-422e-95f4-641184eb6b2e",[202],{"id":203,"data":204,"type":38,"version":20,"maxContentLevel":19},"97c0eb40-5ebd-49c6-9b8b-7a26120629a0",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":205,"binaryCorrect":210,"binaryIncorrect":212},[206,207,208,209],"Which disorder is characterized by decreased bone density and increased fracture risk?","What condition primarily affects older adults and is marked by reduced bone density and a higher chance of fractures?","Which musculoskeletal disorder is known for weakened bones and a greater likelihood of fractures?","Which ailment is associated with lower bone density and an increased risk of bone fractures?",[211],"Osteoporosis",[213],"Osteoarthritis",{"id":215,"data":216,"type":20,"maxContentLevel":19,"version":20,"reviews":220},"2528a179-46c4-46d8-a377-d36114c37237",{"type":20,"title":217,"markdownContent":218,"audioMediaId":219},"Musculoskeletal System and Aging","Aging has a significant impact on the musculoskeletal system and its function. As we age, muscle mass and strength tend to decrease, a process known as sarcopenia. This decline in muscle function can lead to reduced mobility, increased risk of falls, and a diminished ability to perform daily activities. \n\nBone density also decreases with age, resulting in a higher susceptibility to fractures and osteoporosis. As people age, their muscles and tendons become less elastic, making it more difficult to move and increasing the risk of injury. Changes in bone and muscle structure, along with a loss of flexibility, can lead to changes in posture that can increase the risk of pain and injury.\n\nAdditionally, the joints may become less flexible and more prone to degeneration, contributing to the development of arthritis. Despite these age-related changes, maintaining a healthy lifestyle, including regular exercise and a balanced diet, can help preserve musculoskeletal function and overall well-being throughout the aging process.\n\n ![Graph](image://080c1ab9-decd-4bd6-a29e-7056c4303aba \"Bone mass by gender and age. Image: OpenStax College via Wikimedia\")","564fc527-f91b-4d6e-83c7-92bad0ad3ab0",[221],{"id":222,"data":223,"type":38,"version":20,"maxContentLevel":19},"29df642d-22b7-494a-b90f-845eab65bd5c",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":224,"binaryCorrect":229,"binaryIncorrect":231},[225,226,227,228],"What is the term for the age-related decline in muscle mass and strength?","What is the name of the process that causes a decrease in muscle mass and strength as we age?","What term describes the loss of muscle mass and strength associated with aging?","As people get older, they experience a decline in muscle mass and strength. What is this phenomenon called?",[230],"Sarcopenia",[211],[233,384,482],{"id":23,"data":24,"type":25,"version":20,"maxContentLevel":19,"pages":234},[235,275,300,333,355],{"id":29,"data":30,"type":20,"maxContentLevel":19,"version":20,"reviews":34,"parsed":236},{"data":237,"body":240,"toc":273},{"title":238,"description":239},"","The musculoskeletal system is a vital component of human physiology, as it provides the framework and machinery for movement, support, and protection.",{"type":241,"children":242},"root",[243,250,260,265],{"type":244,"tag":245,"props":246,"children":247},"element","p",{},[248],{"type":249,"value":239},"text",{"type":244,"tag":245,"props":251,"children":252},{},[253],{"type":244,"tag":254,"props":255,"children":259},"img",{"alt":256,"src":257,"title":258},"Graph","image://f8e45c6a-a93d-4986-821c-4cf8735b4773"," ",[],{"type":244,"tag":245,"props":261,"children":262},{},[263],{"type":249,"value":264},"Comprised of bones, muscles, tendons, ligaments, and joints, this system works in harmony to enable a wide range of physical activities. From the delicate movements of a pianist's fingers to the powerful strides of an Olympic sprinter, the musculoskeletal system is essential for our daily lives and overall well-being.",{"type":244,"tag":245,"props":266,"children":267},{},[268],{"type":244,"tag":254,"props":269,"children":272},{"alt":256,"src":270,"title":271},"image://548c2946-e43b-47e3-b1e7-80b234fab4fe","The musculoskeletal system.",[],{"title":238,"searchDepth":25,"depth":25,"links":274},[],{"id":47,"data":48,"type":20,"maxContentLevel":19,"version":20,"reviews":52,"parsed":276},{"data":277,"body":279,"toc":298},{"title":238,"description":278},"Building upon the foundation of the musculoskeletal system, muscle tissue plays a crucial role in facilitating movement. There are three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle, which is attached to bones by tendons, is responsible for voluntary movements and is characterized by its striated appearance.",{"type":241,"children":280},[281,285,290],{"type":244,"tag":245,"props":282,"children":283},{},[284],{"type":249,"value":278},{"type":244,"tag":245,"props":286,"children":287},{},[288],{"type":249,"value":289},"Smooth muscle, found in the walls of internal organs, controls involuntary movements such as digestion and blood vessel constriction. Cardiac muscle, exclusive to the heart, is responsible for pumping blood throughout the body. Each type of muscle tissue has a unique structure and function, working together to support the body's diverse range of activities.",{"type":244,"tag":245,"props":291,"children":292},{},[293],{"type":244,"tag":254,"props":294,"children":297},{"alt":256,"src":295,"title":296},"image://e6086768-2e6d-4b25-9821-fd4b313e2dc3","The different types of muscle tissue: smooth, cardiac, skeletal. Image: www.scientificanimations.com via Wikimedia",[],{"title":238,"searchDepth":25,"depth":25,"links":299},[],{"id":66,"data":67,"type":20,"maxContentLevel":19,"version":20,"reviews":71,"parsed":301},{"data":302,"body":304,"toc":331},{"title":238,"description":303},"Muscle contraction is the process by which muscles generate force to produce movement. The sliding filament theory explains this process, stating that the overlapping actin and myosin filaments within muscle fibers slide past one another, shortening the muscle and generating force.",{"type":241,"children":305},[306,310,318,323],{"type":244,"tag":245,"props":307,"children":308},{},[309],{"type":249,"value":303},{"type":244,"tag":245,"props":311,"children":312},{},[313],{"type":244,"tag":254,"props":314,"children":317},{"alt":256,"src":315,"title":316},"image://d7dc5347-60f4-4b0f-b293-e8af33f29920","Muscle contraction on a cellular level. Image: OpenStax via Wikimedia",[],{"type":244,"tag":245,"props":319,"children":320},{},[321],{"type":249,"value":322},"Excitation-contraction coupling is the sequence of events that links the electrical signal from a nerve to the actual muscle contraction. For example, when you lift a cup of coffee, your brain sends an electrical signal to the appropriate muscles, triggering the release of calcium ions and initiating the sliding filament process, ultimately resulting in muscle contraction and movement.",{"type":244,"tag":245,"props":324,"children":325},{},[326],{"type":244,"tag":254,"props":327,"children":330},{"alt":256,"src":328,"title":329},"image://1e09bb0f-1876-4d82-8c96-903c3c1407f4","Muscle contraction on a larger scale. Image: OpenStax via Wikimedia",[],{"title":238,"searchDepth":25,"depth":25,"links":332},[],{"id":87,"data":88,"type":20,"maxContentLevel":19,"version":20,"reviews":92,"parsed":334},{"data":335,"body":337,"toc":353},{"title":238,"description":336},"Muscle metabolism is the process by which muscles obtain and utilize energy for contraction. There are three primary energy sources for muscle metabolism: adenosine triphosphate (ATP), creatine phosphate, and glycogen. ATP is the immediate source of energy for muscle contraction, while creatine phosphate and glycogen serve as energy reserves that can be rapidly converted to ATP when needed.",{"type":241,"children":338},[339,343,348],{"type":244,"tag":245,"props":340,"children":341},{},[342],{"type":249,"value":336},{"type":244,"tag":245,"props":344,"children":345},{},[346],{"type":249,"value":347},"Muscles rely on different metabolic pathways, such as aerobic respiration (the process by which cells use oxygen to convert glucose into energy in the form of ATP) and anaerobic glycolysis (the process by which cells break down glucose into energy in the absence of oxygen) depending on the intensity and duration of the activity.",{"type":244,"tag":245,"props":349,"children":350},{},[351],{"type":249,"value":352},"For instance, during a sprint, muscles might start with aerobic respiration, but quickly switch to anaerobic glycolysis, which is better at providing quicker bursts of energy. On the other hand, during a long-distance run, aerobic respiration will provide a more sustained energy supply.",{"title":238,"searchDepth":25,"depth":25,"links":354},[],{"id":106,"data":107,"type":20,"maxContentLevel":19,"version":20,"reviews":111,"parsed":356},{"data":357,"body":359,"toc":382},{"title":238,"description":358},"Muscle fatigue is the decline in muscle performance and force generation due to prolonged or intense activity. An example of muscle fatigue is the burning sensation and weakness experienced during a challenging workout. There are two types of muscle fatigue: peripheral and central.",{"type":241,"children":360},[361,365,370,375],{"type":244,"tag":245,"props":362,"children":363},{},[364],{"type":249,"value":358},{"type":244,"tag":245,"props":366,"children":367},{},[368],{"type":249,"value":369},"Peripheral fatigue occurs within the muscle itself, often due to the accumulation of metabolic byproducts, depletion of energy reserves, and impaired excitation-contraction coupling. Central fatigue, on the other hand, originates in the central nervous system and involves a decrease in the neural drive to the muscles.",{"type":244,"tag":245,"props":371,"children":372},{},[373],{"type":249,"value":374},"Muscle fatigue can be acute or chronic, and can affect athletes, individuals with certain medical conditions, and those who engage in prolonged or intense physical activity. It can be managed through adequate rest and recovery, proper nutrition, and regular exercise.",{"type":244,"tag":245,"props":376,"children":377},{},[378],{"type":244,"tag":254,"props":379,"children":381},{"alt":256,"src":380,"title":258},"image://f5b9aaec-09d7-40b6-9847-6046c4d5fcdb",[],{"title":238,"searchDepth":25,"depth":25,"links":383},[],{"id":125,"data":126,"type":25,"version":20,"maxContentLevel":19,"pages":385},[386,419,457],{"id":130,"data":131,"type":20,"maxContentLevel":19,"version":20,"reviews":135,"parsed":387},{"data":388,"body":390,"toc":417},{"title":238,"description":389},"Bone tissue is a dynamic and complex structure that provides support, protection, and mineral storage for the body. Composed of organic components, such as collagen fibers, and inorganic minerals, such as calcium and phosphate, bone tissue is both strong and flexible. Bone tissue is made up of two main types of bone: cortical bone and trabecular bone. Cortical bone is dense and compact, while trabecular bone is less dense and has a spongy, honeycomb-like structure. Both types of bone are made up of osteoblasts, osteocytes, and osteoclasts. Osteoblasts are bone-forming cells that are responsible for the synthesis and deposition of the organic matrix of bone tissue.",{"type":241,"children":391},[392,396,404,409],{"type":244,"tag":245,"props":393,"children":394},{},[395],{"type":249,"value":389},{"type":244,"tag":245,"props":397,"children":398},{},[399],{"type":244,"tag":254,"props":400,"children":403},{"alt":256,"src":401,"title":402},"image://5c6deead-9bbb-47d9-89c4-a7d3172ef3a6","Anatomy of a bone. Image: Pbroks13 via Wikimedia",[],{"type":244,"tag":245,"props":405,"children":406},{},[407],{"type":249,"value":408},"Osteocytes are mature bone cells that are embedded in the mineralized matrix and maintain the bone tissue. Osteoclasts are large, multinucleated cells that are responsible for the breakdown and resorption of bone tissue. Bone remodeling, the continuous process of bone formation and resorption, allows the skeleton to adapt to mechanical stress and maintain overall bone health. Interestingly, bones are capable of self-repair, as demonstrated by the healing of fractures through the formation of new bone tissue.",{"type":244,"tag":245,"props":410,"children":411},{},[412],{"type":244,"tag":254,"props":413,"children":416},{"alt":256,"src":414,"title":415},"image://603e79ca-d1f0-4053-8706-6bdf2e8b0a78","Different types of bone cells. Image: OpenStax College via Wikimedia",[],{"title":238,"searchDepth":25,"depth":25,"links":418},[],{"id":151,"data":152,"type":20,"maxContentLevel":19,"version":20,"reviews":156,"parsed":420},{"data":421,"body":423,"toc":455},{"title":238,"description":422},"The human skeletal system is composed of 206 bones, which are divided into two main categories: axial and appendicular. They provide the framework for the body and supports the musculoskeletal system's functions. The axial skeleton, which includes the skull, vertebral column, and rib cage, protects vital organs and maintains the body's central structure. The appendicular skeleton, comprising the limbs and girdles, facilitates movement and interaction with the environment.",{"type":241,"children":424},[425,429,437,442,450],{"type":244,"tag":245,"props":426,"children":427},{},[428],{"type":249,"value":422},{"type":244,"tag":245,"props":430,"children":431},{},[432],{"type":244,"tag":254,"props":433,"children":436},{"alt":256,"src":434,"title":435},"image://fb8c2348-6ef0-4b0a-bb4d-88462ff5a37d","The skeletal system, with the axial and appendicular bones labeled. Image: OpenStax Anatomy and Physiology via Wikimedia",[],{"type":244,"tag":245,"props":438,"children":439},{},[440],{"type":249,"value":441},"Ligaments are fibrous tissues that connect bones to other bones, providing stability to the joints. They are important for maintaining joint integrity and preventing injury. The skeletal system also includes several other structures, such as tendons, which attach muscles to bones, and bursae, which are fluid-filled sacs that reduce friction between bones, tendons, and muscles.",{"type":244,"tag":245,"props":443,"children":444},{},[445],{"type":244,"tag":254,"props":446,"children":449},{"alt":256,"src":447,"title":448},"image://7710bc92-280c-4e1f-bf93-12f0adf815ef","A ligament. Image: www.scientificanimations.com via Wikimedia",[],{"type":244,"tag":245,"props":451,"children":452},{},[453],{"type":249,"value":454},"Together, these two components form a dynamic and adaptable system that enables a wide range of physical activities and functions.",{"title":238,"searchDepth":25,"depth":25,"links":456},[],{"id":170,"data":171,"type":20,"maxContentLevel":19,"version":20,"reviews":175,"parsed":458},{"data":459,"body":461,"toc":480},{"title":238,"description":460},"Joints are the points of connection between bones, allowing for movement and providing stability. They are classified into three categories: fibrous, cartilaginous, and synovial joints. Fibrous joints, such as the sutures in the skull, are immovable and held together by dense connective tissue. Cartilaginous joints, like the intervertebral discs, permit limited movement and are connected by cartilage.",{"type":241,"children":462},[463,467,472],{"type":244,"tag":245,"props":464,"children":465},{},[466],{"type":249,"value":460},{"type":244,"tag":245,"props":468,"children":469},{},[470],{"type":249,"value":471},"The most common type of joint is the synovial joint, which is found in the majority of the body's joints, including the knees, hips, and shoulders. They allow for a wide range of motion and are characterized by a fluid-filled joint cavity surrounded by a fibrous capsule. There are several different types of synovial joints, including hinge joints, ball-and-socket joints, and pivot joints. Each type of joint contributes to the overall flexibility and stability of the musculoskeletal system.",{"type":244,"tag":245,"props":473,"children":474},{},[475],{"type":244,"tag":254,"props":476,"children":479},{"alt":256,"src":477,"title":478},"image://265b82b7-dcde-488e-bbfd-d0d59433e8fc","The three categories of joints: cartilaginous, fibrous, synovial. Image: www.scientificanimations.com via Wikimedia",[],{"title":238,"searchDepth":25,"depth":25,"links":481},[],{"id":191,"data":192,"type":25,"version":20,"maxContentLevel":19,"pages":483},[484,522],{"id":196,"data":197,"type":20,"maxContentLevel":19,"version":20,"reviews":201,"parsed":485},{"data":486,"body":488,"toc":520},{"title":238,"description":487},"Musculoskeletal disorders encompass a variety of conditions that affect the bones, muscles, and joints, often causing pain and reduced mobility. Osteoporosis, a disorder characterized by decreased bone density and increased fracture risk, is a common example that primarily affects older adults, particularly postmenopausal women.",{"type":241,"children":489},[490,494,502,507,515],{"type":244,"tag":245,"props":491,"children":492},{},[493],{"type":249,"value":487},{"type":244,"tag":245,"props":495,"children":496},{},[497],{"type":244,"tag":254,"props":498,"children":501},{"alt":256,"src":499,"title":500},"image://69e3ec5e-6bcc-4bf2-8c82-eff0c9d5a7f4","Osteoporosis. Image: Laboratoires Servier via Wikimedia",[],{"type":244,"tag":245,"props":503,"children":504},{},[505],{"type":249,"value":506},"Osteoarthritis is a degenerative joint disease that occurs when the protective cartilage that cushions the ends of bones wears down over time, causing pain, stiffness, and loss of function. Rheumatoid arthritis is an autoimmune disorder that causes inflammation in the joints, leading to pain, stiffness, and deformity. Carpal tunnel syndrome is a condition in which the median nerve in the wrist becomes compressed, causing pain, numbness, and weakness in the hand and arm.",{"type":244,"tag":245,"props":508,"children":509},{},[510],{"type":244,"tag":254,"props":511,"children":514},{"alt":256,"src":512,"title":513},"image://9d957f2c-62ae-4746-b191-9456a38e7dee","Osteoarthritis and rheumatoid arthritis. Image: Laboratoires Servier via Wikimedia",[],{"type":244,"tag":245,"props":516,"children":517},{},[518],{"type":249,"value":519},"Early diagnosis and appropriate treatment of these conditions are essential for maintaining overall musculoskeletal health and quality of life.",{"title":238,"searchDepth":25,"depth":25,"links":521},[],{"id":215,"data":216,"type":20,"maxContentLevel":19,"version":20,"reviews":220,"parsed":523},{"data":524,"body":526,"toc":550},{"title":238,"description":525},"Aging has a significant impact on the musculoskeletal system and its function. As we age, muscle mass and strength tend to decrease, a process known as sarcopenia. This decline in muscle function can lead to reduced mobility, increased risk of falls, and a diminished ability to perform daily activities.",{"type":241,"children":527},[528,532,537,542],{"type":244,"tag":245,"props":529,"children":530},{},[531],{"type":249,"value":525},{"type":244,"tag":245,"props":533,"children":534},{},[535],{"type":249,"value":536},"Bone density also decreases with age, resulting in a higher susceptibility to fractures and osteoporosis. As people age, their muscles and tendons become less elastic, making it more difficult to move and increasing the risk of injury. Changes in bone and muscle structure, along with a loss of flexibility, can lead to changes in posture that can increase the risk of pain and injury.",{"type":244,"tag":245,"props":538,"children":539},{},[540],{"type":249,"value":541},"Additionally, the joints may become less flexible and more prone to degeneration, contributing to the development of arthritis. Despite these age-related changes, maintaining a healthy lifestyle, including regular exercise and a balanced diet, can help preserve musculoskeletal function and overall well-being throughout the aging process.",{"type":244,"tag":245,"props":543,"children":544},{},[545],{"type":244,"tag":254,"props":546,"children":549},{"alt":256,"src":547,"title":548},"image://080c1ab9-decd-4bd6-a29e-7056c4303aba","Bone mass by gender and age. Image: OpenStax College via Wikimedia",[],{"title":238,"searchDepth":25,"depth":25,"links":551},[],{"left":4,"top":4,"width":553,"height":553,"rotate":4,"vFlip":6,"hFlip":6,"body":554},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":553,"height":553,"rotate":4,"vFlip":6,"hFlip":6,"body":556},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 5h16M4 12h16M4 19h16\"/>",1778179391474]