Human anatomy anus

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Anal cancer is a type of cancer that forms in tissues of the anus. The anus is the opening of the rectum to the outside of the body and at the end of the GI tract. Sometimes anal cancer causes no symptoms at all.

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Chyme released from the stomach enters the small intestinewhich is the primary digestive organ in the body. Not only is this where most digestion occurs, it is also where practically all absorption occurs. The longest part of the alimentary canal, the small intestine is about 3.

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The inner lining of the anal canal is the mucosa. Most anal cancers start from cells in the mucosa. Glands and ducts tubes leading from the glands are found under the mucosa.

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If your institution subscribes to this resource, and you don't have a MyAccess Profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus. Abdominal symptoms are common; the history and physical examination are the basis for differential diagnosis and efficient use of laboratory and imaging studies. History must delineate the character and sequence of the symptoms. Familiarity with the anatomy and pathophysiology is essential for interpretation of abdominal findings.

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The human body is an amazing thing. For each one of us, it's the most intimate object we know. And yet most of us don't know enough about it: its features, functions, quirks, and mysteries.

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If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Science Health and medicine Human anatomy and physiology Gastrointestinal system introduction.

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Food is our fuel, and its nutrients give our bodies' cells the energy and substances they need to work. But before food can do that, it must be digested into small pieces the body can absorb and use. The first step in the digestive process happens before we even taste food.

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The digestive system is made up of the gastrointestinal tract—also called the GI tract or digestive tract—and the liverpancreasand gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagusstomach, small intestine, large intestine, and anus.

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The large intestine absorbs water from the remaining indigestible food matter and compacts feces prior to defecation. The function of the large intestine or large bowel is to absorb water from the remaining indigestible food matter, and then to pass the useless waste material from the body. The large intestine consists of the cecum and colon.

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Which organ is the most important organ in the body? Most people would say the heart or the brain, completely overlooking the gastrointestinal tract GI tract. Though definitely not the most attractive organs in the body, they are certainly among the most important.

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