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substances from the bloodstream, maintaining fluid and electrolyte balance, and regulating blood pressure. Comprised of the kidneys, ureters, bladder, and urethra, the renal system works in concert to ensure the proper functioning of our bodies. \n\nThe kidneys, in particular, play a crucial role in filtering blood and producing urine, which is then transported through the renal pelvis and ureters to the bladder for storage. Every day, your kidneys filter about 150 quarts (140 liters) of blood to remove wastes and balance fluids. This process produces about 2 quarts (1.8 liters) of urine per day.  Finally, the urethra serves as the exit point for urine to be expelled from the body.\n\n ![Graph](image://6702bf67-23ec-4c96-934a-99a2183c2cd4 \"The (female) urinary system. Image: BruceBlaus via Wikimedia\")","648741f8-774a-4b1c-b2e3-26739467af47",[35],{"id":36,"data":37,"type":38,"version":20,"maxContentLevel":19},"b468a7bb-343b-4c59-a188-11a1eab18b8d",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":39,"binaryCorrect":44,"binaryIncorrect":46},11,[40,41,42,43],"Which organ plays a crucial role in filtering blood and producing urine?","In the urinary system, which organ is responsible for filtering blood and creating urine?","Which part of the renal system is essential for blood filtration and urine production?","What organ in the human body is crucial for removing waste from the blood and generating urine?",[45],"Kidneys",[47],"Renal pelvis",{"id":49,"data":50,"type":20,"maxContentLevel":19,"version":20,"reviews":54},"159c7c56-3f85-4784-93b4-63850e981b49",{"type":20,"title":51,"markdownContent":52,"audioMediaId":53},"Anatomy of the Kidneys","Building upon the importance of the kidneys in the urinary system, these bean-shaped organs are composed of millions of functional units called nephrons. Nephrons are responsible for filtering blood and producing urine through a complex network of blood vessels. \n\n ![Graph](image://76a4d027-f683-4615-8ec1-d7304e2da265 \"Kidney anatomy. Image: BruceBlaus via Wikimedia\")\n\nEach nephron contains a glomerulus, a cluster of capillaries that filters blood, and a tubule, which reabsorbs and secretes substances to form urine. Blood vessels, such as the renal artery and renal vein, supply the kidneys with blood and remove filtered blood, respectively. Understanding the intricate structure of the kidneys is essential to grasping the process of urine formation. Although your kidneys pump more than 50 gallons of blood per day and are a crucial part of the urinary system, you only need one to survive.","bf03c2c6-ae74-4734-9286-1c249120b574",[55],{"id":56,"data":57,"type":38,"version":20,"maxContentLevel":19},"5956578c-4501-4e0c-a253-bb5e6b1e587e",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":58,"binaryCorrect":63,"binaryIncorrect":65},[59,60,61,62],"What are the functional units of the kidneys?","What are the primary structures within the kidneys responsible for filtering blood and producing urine?","Which components of the kidneys play a key role in the process of urine formation?","In the kidneys, what are the essential units that carry out blood filtration and urine production?",[64],"Nephrons",[66],"Capillaries",{"id":68,"data":69,"type":20,"maxContentLevel":19,"version":20,"reviews":73},"fb4b1400-ad80-447f-bcad-1824f11c6757",{"type":20,"title":70,"markdownContent":71,"audioMediaId":72},"Urine Formation","The process of urine formation is a three-step procedure involving filtration, reabsorption, and secretion. Filtration occurs in the glomerulus, where blood pressure forces water, ions, and small molecules out of the blood and into the nephron's tubule. \n\nReabsorption is the next step, where essential substances like glucose, amino acids, and water are reabsorbed back into the bloodstream through the tubule's walls. Urine is made up of 95% water. The rest is 2.5% urea and 2.5% salts, minerals, and other substances produced during normal body processes.\n\nFinally, secretion involves the active transport of waste products and excess ions from the blood into the tubule, ultimately forming urine. This intricate process ensures that our bodies maintain proper fluid balance and eliminate waste efficiently.\n\n ![Graph](image://69e44bfb-e8c4-413a-9054-926117dbf07c \"The physiology of a nephron. Image: Cenveo via CCCS Open Textbooks\")","1617bd01-0748-4f5d-9804-3a77f8003e6c",[74],{"id":75,"data":76,"type":38,"version":20,"maxContentLevel":19},"c568666a-41ca-4191-8492-263ae83b5394",{"type":38,"reviewType":25,"spacingBehaviour":20,"binaryQuestion":77,"binaryCorrect":82,"binaryIncorrect":84},[78,79,80,81],"What percentage of urine is made up of water?","What proportion of water is found in urine?","In urine composition, what percentage consists of water?","Out of the total composition of urine, how much is water in terms of percentage?",[83],"95%",[85],"75%",{"id":87,"data":88,"type":20,"maxContentLevel":19,"version":20,"reviews":92},"d474d170-0186-47c8-bde2-e2eae054af5a",{"type":20,"title":89,"markdownContent":90,"audioMediaId":91},"Regulation of Urine Concentration","The regulation of urine concentration and volume is crucial for maintaining homeostasis within the body. Hormones such as Antidiuretic hormone (ADH), Aldosterone, and the renin-angiotensin-aldosterone system (RAAS) play key roles in this process. \n\nADH, released by the pituitary gland, increases water reabsorption in the kidneys, leading to more concentrated urine. Aldosterone, produced by the adrenal glands, regulates sodium and potassium levels, influencing urine concentration. The RAAS system helps regulate blood pressure and fluid balance by adjusting the constriction of blood vessels and the release of aldosterone. Proper regulation of urine concentration and volume is essential for maintaining overall health and preventing dehydration or fluid overload.\n","e192d58f-df16-40fe-9321-4b04d8960bd9",[93],{"id":94,"data":95,"type":38,"version":20,"maxContentLevel":19},"da5f0e6c-b58c-4419-ba8d-cfa4afdd57f0",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":96,"multiChoiceCorrect":101,"multiChoiceIncorrect":103},[97,98,99,100],"Which hormone increases water reabsorption in the kidneys?","Which hormone is responsible for enhancing water reabsorption in the kidneys?","Which hormone, when released by the pituitary gland, leads to more concentrated urine by increasing water reabsorption in the kidneys?","What hormone plays a key role in regulating urine concentration by promoting water reabsorption in the kidneys?",[102],"Antidiuretic hormone",[104,105,106],"Aldosterone","Renin","Angiotensin",{"id":108,"data":109,"type":20,"maxContentLevel":19,"version":20,"reviews":113},"368db2c2-5a28-4cf0-9213-161d8ba62d0c",{"type":20,"title":110,"markdownContent":111,"audioMediaId":112},"Anatomy of the Urinary Tract","The urinary tract consists of the ureters, bladder, and urethra, which work together to transport, store, and expel urine from the body. The ureters are muscular tubes that propel urine from the renal pelvis of the kidneys to the bladder. The bladder, a hollow muscular organ, stores urine until it is full, typically holding up to 500 milliliters (17oz). The urethra, a tube extending from the bladder to the outside of the body, allows for the expulsion of urine during the process of micturition.\n\nMicturition, or urination, is the process by which the bladder empties and urine is expelled from the body. This process is regulated by the coordination of the nervous system and the muscles of the bladder and urethra. Micturition begins when the bladder fills with urine, causing stretch receptors in the bladder wall to send signals to the brain. In response, the brain signals the detrusor muscle of the bladder to contract and the internal and external urethral sphincters to relax, allowing urine to flow through the urethra and out of the body.\n\n ![Graph](image://dc64511f-32b6-4bfc-96ec-c5ab7a242a47 \"The (male) urinary tract. Image: Lennert B via Wikimedia\")","ca44c873-eb53-4d25-90b3-fac0bb042be3",[114],{"id":115,"data":116,"type":38,"version":20,"maxContentLevel":19},"dcb9618c-72a5-46db-89b9-c5daa48002fe",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":117,"multiChoiceCorrect":122,"multiChoiceIncorrect":124},[118,119,120,121],"What is the typical storage capacity of the bladder?","How much urine can the bladder usually hold?","What is the normal maximum volume of urine the bladder can store?","Up to what volume, in milliliters or ounces, can the bladder typically contain?",[123],"Up to 500 milliliters (17oz)",[125,126,127],"Up to 250 milliliters (8.5oz)","Up to 750 milliliters (25oz)","Up to 1000 milliliters (34oz)",{"id":129,"data":130,"type":25,"version":20,"maxContentLevel":19,"pages":132},"eb1096c8-1fea-46b7-8729-604c99c859d8",{"type":25,"title":131},"Urine Formation and Regulation",[133,154,175],{"id":134,"data":135,"type":20,"maxContentLevel":19,"version":20,"reviews":139},"f41136b4-ed93-470c-8b63-9b6b3f1aa693",{"type":20,"title":136,"markdownContent":137,"audioMediaId":138},"Micturition","The urinary system plays a critical role in maintaining fluid and electrolyte balance within the body. By regulating the amount of water and ions reabsorbed or secreted during urine formation, the kidneys help ensure that the body maintains the proper balance of fluids and electrolytes. This balance is essential for maintaining blood pressure, nerve function, and muscle function, among other physiological processes.\n\nIn addition to fluid and electrolyte balance, the urinary system is also responsible for maintaining acid-base balance in the body. The kidneys help regulate blood pH by excreting hydrogen ions and reabsorbing bicarbonate ions during urine formation. This process ensures that the body maintains a stable pH, which is crucial for proper enzyme function, cellular metabolism, and overall health. Acid-base balance is essential for maintaining the optimal functioning of our physiological processes.\n","b3185b88-2b57-42ed-bd0d-46dbb0316aba",[140],{"id":141,"data":142,"type":38,"version":20,"maxContentLevel":19},"a1d06992-dfc1-40c6-bc71-091973bae17e",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":143,"multiChoiceCorrect":148,"multiChoiceIncorrect":150},[144,145,146,147],"What is crucial for proper enzyme function, cellular metabolism, and overall health?","What is essential for the optimal functioning of enzymes, cells, and general well-being?","What factor is important for ensuring the efficiency of enzyme activity, cell metabolism, and overall wellness?","What is necessary for supporting the proper functioning of enzymes, cellular processes, and maintaining good health?",[149],"Maintaining a stable pH",[151,152,153],"Maintaining constant body temperature","Regulating heart rate","Controlling blood sugar levels",{"id":155,"data":156,"type":20,"maxContentLevel":19,"version":20,"reviews":160},"219a96dc-227e-4d58-a807-44ebc84008b6",{"type":20,"title":157,"markdownContent":158,"audioMediaId":159},"Urinary Disorders","The urinary system, like any other system in the body, can be affected by various disorders. Common urinary disorders include kidney stones, which are hard deposits of minerals and salts that form in the kidneys and can cause severe pain when passing through the urinary tract. \n\nUrinary tract infections (UTIs) are another common issue, often caused by bacteria entering the urethra and traveling up to the bladder, leading to inflammation and discomfort. Early detection and treatment of these disorders are crucial for maintaining overall health and preventing complications.\n\n ![Graph](image://1b1251c3-6f93-428d-9f7a-4c0fa70ad75e \"Kidney stones. Image: BruceBlaus via Wikimedia\")","78dad826-cb04-4614-84e2-5640f907ccd5",[161],{"id":162,"data":163,"type":38,"version":20,"maxContentLevel":19},"10ee6535-d803-4363-b939-37a656c41e71",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":164,"multiChoiceCorrect":169,"multiChoiceIncorrect":171},[165,166,167,168],"What is a common urinary disorder involving hard deposits of minerals and salts?","What urinary disorder is characterized by the formation of hard mineral and salt deposits?","Which urinary condition is caused by the accumulation of hard mineral and salt crystals in the kidneys?","What is the name of the urinary disorder that results from the presence of hard mineral and salt buildups in the kidneys?",[170],"Kidney stones",[172,173,174],"Bladder infection","Urethritis","Interstitial cystitis",{"id":176,"data":177,"type":20,"maxContentLevel":19,"version":20,"reviews":181},"9b2eb5d4-95b1-4d16-ad4c-6e1c52319ed0",{"type":20,"title":178,"markdownContent":179,"audioMediaId":180},"Urinary System and Aging","As we age, the urinary system undergoes various changes that can affect its function. The kidneys may decrease in size and function, leading to a reduced ability to filter waste products and maintain fluid balance. \n\nThe bladder's capacity may also decrease, and the muscles controlling micturition may weaken, resulting in more frequent urination or difficulty emptying the bladder completely. These age-related changes can increase the risk of urinary disorders and complications, making it essential to monitor and maintain urinary health throughout our lives.","af017703-5de8-4024-9b40-587e55db3f7e",[182],{"id":183,"data":184,"type":38,"version":20,"maxContentLevel":19},"0ab19630-4203-4907-9af7-d96cb78b6563",{"type":38,"reviewType":19,"spacingBehaviour":20,"multiChoiceQuestion":185,"multiChoiceCorrect":190,"multiChoiceIncorrect":192},[186,187,188,189],"What happens to the kidneys as we age?","What changes occur in the kidneys during the aging process?","As we grow older, how do our kidneys change in terms of size and function?","What is the impact of aging on the size and functionality of our kidneys?",[191],"Decrease in size and function",[193,194,195],"Increase in size and function","Remain the same","Improve filtration ability",[197,328],{"id":23,"data":24,"type":25,"version":20,"maxContentLevel":19,"pages":198},[199,231,256,286,303],{"id":29,"data":30,"type":20,"maxContentLevel":19,"version":20,"reviews":34,"parsed":200},{"data":201,"body":204,"toc":229},{"title":202,"description":203},"","The urinary system is a vital component of human physiology, responsible for filtering waste products and excess substances from the bloodstream, maintaining fluid and electrolyte balance, and regulating blood pressure. Comprised of the kidneys, ureters, bladder, and urethra, the renal system works in concert to ensure the proper functioning of our bodies.",{"type":205,"children":206},"root",[207,214,219],{"type":208,"tag":209,"props":210,"children":211},"element","p",{},[212],{"type":213,"value":203},"text",{"type":208,"tag":209,"props":215,"children":216},{},[217],{"type":213,"value":218},"The kidneys, in particular, play a crucial role in filtering blood and producing urine, which is then transported through the renal pelvis and ureters to the bladder for storage. Every day, your kidneys filter about 150 quarts (140 liters) of blood to remove wastes and balance fluids. This process produces about 2 quarts (1.8 liters) of urine per day.  Finally, the urethra serves as the exit point for urine to be expelled from the body.",{"type":208,"tag":209,"props":220,"children":221},{},[222],{"type":208,"tag":223,"props":224,"children":228},"img",{"alt":225,"src":226,"title":227},"Graph","image://6702bf67-23ec-4c96-934a-99a2183c2cd4","The (female) urinary system. Image: BruceBlaus via Wikimedia",[],{"title":202,"searchDepth":25,"depth":25,"links":230},[],{"id":49,"data":50,"type":20,"maxContentLevel":19,"version":20,"reviews":54,"parsed":232},{"data":233,"body":235,"toc":254},{"title":202,"description":234},"Building upon the importance of the kidneys in the urinary system, these bean-shaped organs are composed of millions of functional units called nephrons. Nephrons are responsible for filtering blood and producing urine through a complex network of blood vessels.",{"type":205,"children":236},[237,241,249],{"type":208,"tag":209,"props":238,"children":239},{},[240],{"type":213,"value":234},{"type":208,"tag":209,"props":242,"children":243},{},[244],{"type":208,"tag":223,"props":245,"children":248},{"alt":225,"src":246,"title":247},"image://76a4d027-f683-4615-8ec1-d7304e2da265","Kidney anatomy. Image: BruceBlaus via Wikimedia",[],{"type":208,"tag":209,"props":250,"children":251},{},[252],{"type":213,"value":253},"Each nephron contains a glomerulus, a cluster of capillaries that filters blood, and a tubule, which reabsorbs and secretes substances to form urine. Blood vessels, such as the renal artery and renal vein, supply the kidneys with blood and remove filtered blood, respectively. Understanding the intricate structure of the kidneys is essential to grasping the process of urine formation. Although your kidneys pump more than 50 gallons of blood per day and are a crucial part of the urinary system, you only need one to survive.",{"title":202,"searchDepth":25,"depth":25,"links":255},[],{"id":68,"data":69,"type":20,"maxContentLevel":19,"version":20,"reviews":73,"parsed":257},{"data":258,"body":260,"toc":284},{"title":202,"description":259},"The process of urine formation is a three-step procedure involving filtration, reabsorption, and secretion. Filtration occurs in the glomerulus, where blood pressure forces water, ions, and small molecules out of the blood and into the nephron's tubule.",{"type":205,"children":261},[262,266,271,276],{"type":208,"tag":209,"props":263,"children":264},{},[265],{"type":213,"value":259},{"type":208,"tag":209,"props":267,"children":268},{},[269],{"type":213,"value":270},"Reabsorption is the next step, where essential substances like glucose, amino acids, and water are reabsorbed back into the bloodstream through the tubule's walls. Urine is made up of 95% water. The rest is 2.5% urea and 2.5% salts, minerals, and other substances produced during normal body processes.",{"type":208,"tag":209,"props":272,"children":273},{},[274],{"type":213,"value":275},"Finally, secretion involves the active transport of waste products and excess ions from the blood into the tubule, ultimately forming urine. This intricate process ensures that our bodies maintain proper fluid balance and eliminate waste efficiently.",{"type":208,"tag":209,"props":277,"children":278},{},[279],{"type":208,"tag":223,"props":280,"children":283},{"alt":225,"src":281,"title":282},"image://69e44bfb-e8c4-413a-9054-926117dbf07c","The physiology of a nephron. Image: Cenveo via CCCS Open Textbooks",[],{"title":202,"searchDepth":25,"depth":25,"links":285},[],{"id":87,"data":88,"type":20,"maxContentLevel":19,"version":20,"reviews":92,"parsed":287},{"data":288,"body":290,"toc":301},{"title":202,"description":289},"The regulation of urine concentration and volume is crucial for maintaining homeostasis within the body. Hormones such as Antidiuretic hormone (ADH), Aldosterone, and the renin-angiotensin-aldosterone system (RAAS) play key roles in this process.",{"type":205,"children":291},[292,296],{"type":208,"tag":209,"props":293,"children":294},{},[295],{"type":213,"value":289},{"type":208,"tag":209,"props":297,"children":298},{},[299],{"type":213,"value":300},"ADH, released by the pituitary gland, increases water reabsorption in the kidneys, leading to more concentrated urine. Aldosterone, produced by the adrenal glands, regulates sodium and potassium levels, influencing urine concentration. The RAAS system helps regulate blood pressure and fluid balance by adjusting the constriction of blood vessels and the release of aldosterone. Proper regulation of urine concentration and volume is essential for maintaining overall health and preventing dehydration or fluid overload.",{"title":202,"searchDepth":25,"depth":25,"links":302},[],{"id":108,"data":109,"type":20,"maxContentLevel":19,"version":20,"reviews":113,"parsed":304},{"data":305,"body":307,"toc":326},{"title":202,"description":306},"The urinary tract consists of the ureters, bladder, and urethra, which work together to transport, store, and expel urine from the body. The ureters are muscular tubes that propel urine from the renal pelvis of the kidneys to the bladder. The bladder, a hollow muscular organ, stores urine until it is full, typically holding up to 500 milliliters (17oz). The urethra, a tube extending from the bladder to the outside of the body, allows for the expulsion of urine during the process of micturition.",{"type":205,"children":308},[309,313,318],{"type":208,"tag":209,"props":310,"children":311},{},[312],{"type":213,"value":306},{"type":208,"tag":209,"props":314,"children":315},{},[316],{"type":213,"value":317},"Micturition, or urination, is the process by which the bladder empties and urine is expelled from the body. This process is regulated by the coordination of the nervous system and the muscles of the bladder and urethra. Micturition begins when the bladder fills with urine, causing stretch receptors in the bladder wall to send signals to the brain. In response, the brain signals the detrusor muscle of the bladder to contract and the internal and external urethral sphincters to relax, allowing urine to flow through the urethra and out of the body.",{"type":208,"tag":209,"props":319,"children":320},{},[321],{"type":208,"tag":223,"props":322,"children":325},{"alt":225,"src":323,"title":324},"image://dc64511f-32b6-4bfc-96ec-c5ab7a242a47","The (male) urinary tract. Image: Lennert B via Wikimedia",[],{"title":202,"searchDepth":25,"depth":25,"links":327},[],{"id":129,"data":130,"type":25,"version":20,"maxContentLevel":19,"pages":329},[330,347,372],{"id":134,"data":135,"type":20,"maxContentLevel":19,"version":20,"reviews":139,"parsed":331},{"data":332,"body":334,"toc":345},{"title":202,"description":333},"The urinary system plays a critical role in maintaining fluid and electrolyte balance within the body. By regulating the amount of water and ions reabsorbed or secreted during urine formation, the kidneys help ensure that the body maintains the proper balance of fluids and electrolytes. This balance is essential for maintaining blood pressure, nerve function, and muscle function, among other physiological processes.",{"type":205,"children":335},[336,340],{"type":208,"tag":209,"props":337,"children":338},{},[339],{"type":213,"value":333},{"type":208,"tag":209,"props":341,"children":342},{},[343],{"type":213,"value":344},"In addition to fluid and electrolyte balance, the urinary system is also responsible for maintaining acid-base balance in the body. The kidneys help regulate blood pH by excreting hydrogen ions and reabsorbing bicarbonate ions during urine formation. This process ensures that the body maintains a stable pH, which is crucial for proper enzyme function, cellular metabolism, and overall health. Acid-base balance is essential for maintaining the optimal functioning of our physiological processes.",{"title":202,"searchDepth":25,"depth":25,"links":346},[],{"id":155,"data":156,"type":20,"maxContentLevel":19,"version":20,"reviews":160,"parsed":348},{"data":349,"body":351,"toc":370},{"title":202,"description":350},"The urinary system, like any other system in the body, can be affected by various disorders. Common urinary disorders include kidney stones, which are hard deposits of minerals and salts that form in the kidneys and can cause severe pain when passing through the urinary tract.",{"type":205,"children":352},[353,357,362],{"type":208,"tag":209,"props":354,"children":355},{},[356],{"type":213,"value":350},{"type":208,"tag":209,"props":358,"children":359},{},[360],{"type":213,"value":361},"Urinary tract infections (UTIs) are another common issue, often caused by bacteria entering the urethra and traveling up to the bladder, leading to inflammation and discomfort. Early detection and treatment of these disorders are crucial for maintaining overall health and preventing complications.",{"type":208,"tag":209,"props":363,"children":364},{},[365],{"type":208,"tag":223,"props":366,"children":369},{"alt":225,"src":367,"title":368},"image://1b1251c3-6f93-428d-9f7a-4c0fa70ad75e","Kidney stones. Image: BruceBlaus via Wikimedia",[],{"title":202,"searchDepth":25,"depth":25,"links":371},[],{"id":176,"data":177,"type":20,"maxContentLevel":19,"version":20,"reviews":181,"parsed":373},{"data":374,"body":376,"toc":387},{"title":202,"description":375},"As we age, the urinary system undergoes various changes that can affect its function. The kidneys may decrease in size and function, leading to a reduced ability to filter waste products and maintain fluid balance.",{"type":205,"children":377},[378,382],{"type":208,"tag":209,"props":379,"children":380},{},[381],{"type":213,"value":375},{"type":208,"tag":209,"props":383,"children":384},{},[385],{"type":213,"value":386},"The bladder's capacity may also decrease, and the muscles controlling micturition may weaken, resulting in more frequent urination or difficulty emptying the bladder completely. These age-related changes can increase the risk of urinary disorders and complications, making it essential to monitor and maintain urinary health throughout our lives.",{"title":202,"searchDepth":25,"depth":25,"links":388},[],{"left":4,"top":4,"width":390,"height":390,"rotate":4,"vFlip":6,"hFlip":6,"body":391},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":390,"height":390,"rotate":4,"vFlip":6,"hFlip":6,"body":393},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 5h16M4 12h16M4 19h16\"/>",1778179390610]