Questions: LEARNING OBJECTIVE: Determine the structure and function of the stomach. Which substance secreted by the stomach is necessary for the absorption of vitamin B12 by the small intestine? a.) Grehlin b.) Intrinsic factor c.) Gastrin d.) Pepsinogen

LEARNING OBJECTIVE: Determine the structure and function of the stomach. Which substance secreted by the stomach is necessary for the absorption of vitamin B12 by the small intestine? a.) Grehlin b.) Intrinsic factor c.) Gastrin d.) Pepsinogen
Transcript text: LEARNING OBJECTIVE: Determine the structure and function of the stomach. Which substance secreted by the stomach is necessary for the absorption of vitamin B12 by the small intestine? a.) Grehlin b.) Intrinsic factor c.) Gastrin d.) Pepsinogen
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Solution

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The answer is the second one (b): Intrinsic factor.

Explanation for each option:

a.) Grehlin - Incorrect. Ghrelin is a hormone produced by the stomach that stimulates appetite and increases food intake, but it is not involved in the absorption of vitamin B12.

b.) Intrinsic factor - Correct. Intrinsic factor is a glycoprotein secreted by the parietal cells of the stomach. It is essential for the absorption of vitamin B12 in the small intestine.

c.) Gastrin - Incorrect. Gastrin is a hormone that stimulates the secretion of gastric acid by the stomach, but it does not play a role in vitamin B12 absorption.

d.) Pepsinogen - Incorrect. Pepsinogen is an inactive enzyme secreted by the stomach that is converted into pepsin to aid in protein digestion, but it is not involved in the absorption of vitamin B12.

Summary: The substance secreted by the stomach necessary for the absorption of vitamin B12 by the small intestine is intrinsic factor.

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