ANIMAL PHYSIOLOGY
DIGESTION IN HUMANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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pancreas
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small intestine
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liver
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stomach
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Detailed explanation-1: -Parietal cells within the stomach lining secrete hydrochloric acid that lowers the pH of the stomach. A low pH (1.5 to 2) activates pepsin. Acetylcholine, gastrin, and histamine stimulate the proton pump in parietal cells to release hydrogen ions and decrease pH.
Detailed explanation-2: -Stomach acid’s low pH level is largely due to hydrochloric acid (HCl).
Detailed explanation-3: -Lack of vitamins. Nutrients such as iron, zinc, and B vitamins are essential for maintaining stomach acid levels. A poor diet can result in low stomach acid, as can a loss of nutrients due to health problems, stress, smoking, or alcohol.
Detailed explanation-4: -The hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. The acidic gastric juice also kills bacteria.
Detailed explanation-5: -Normal Results The normal volume of the stomach fluid is 20 to 100 mL and the pH is acidic (1.5 to 3.5).