MEDICAL
RECTUM AND ANUS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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it has a thick layer of stratified squamous cells that are rapidly produced to replace the damaged cells that are exposed to the acid
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it secretes a protective layer of mucous that neutralizes the acid
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it has a specialized membrane of cartilaginous tissue that is immune to the secreted acid
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none of the above
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Detailed explanation-1: -The acidic gastric juice also kills bacteria. The mucus covers the stomach wall with a protective coating. Together with the bicarbonate, this ensures that the stomach wall itself is not damaged by the hydrochloric acid.
Detailed explanation-2: -In the duodenum, gastric acid is neutralized by bicarbonate. This also blocks gastric enzymes that have their optima in the acid range of pH. The secretion of bicarbonate from the pancreas is stimulated by secretin.
Detailed explanation-3: -The mucosal barrier protects the stomach from self-digestion. It includes a thick coating of bicarbonate-rich mucus; the mucus is physically protective, and bicarbonate neutralizes gastric acid.
Detailed explanation-4: -It is secreted by the oxyntic cells of the gastric gland in the stomach.