MEDICAL
RECTUM AND ANUS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Digests food in the mouth.
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Digests food in the stomach
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Protects the stomach from digesting iteself
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Absorbs nutrients from food so the body has energy.
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Detailed explanation-1: -In the stomach several mucosal defence mechanisms protect the stomach against hydrochloric acid and noxious agents. The pre-epithelial protection is made up by the mucus-bicarbonate barrier. Mucus and bicarbonate, secreted by mucus cells, create a pH gradient maintaining the epithelial cell surface at near neutral pH.
Detailed explanation-2: -The stomach is protected from self-digestion by the mucosal barrier. This barrier has several components. First, the stomach wall is covered by a thick coating of bicarbonate-rich mucus. This mucus forms a physical barrier, and its bicarbonate ions neutralize acid.
Detailed explanation-3: -The inner surface of the stomach is lined by a mucous membrane known as the gastric mucosa. The mucosa is always covered by a layer of thick mucus that is secreted by tall columnar epithelial cells.
Detailed explanation-4: -The epithelial cells are covered by a thick layer of mucus, which is produced by goblet cells, and serves as the first line of innate host defense. Mucus forms a protective physical barrier that prevents microorganism and noxious substances from reaching the surface of the epithelium.