Question

2 — digestion
learning objective: recognize the actions of the digestive organs and secretions as food moves through the digestive system.
which secretion is important in being able to properly absorb vitamin b12?
a.) pepsinogen
b.) intrinsic factor
c.) gastric lipase
d.) hydrochloric acid

Explanation:

• Pepsinogen is involved in protein digestion (converted to pepsin), not B12 absorption.
• Intrinsic factor, secreted by the stomach, binds to vitamin B12, allowing its absorption in the ileum.
• Gastric lipase digests fats, not related to B12 absorption.
• Hydrochloric acid aids in protein digestion and kills microbes, not B12 absorption.

Answer:

b.) Intrinsic factor