Question

Salivary gland enzymes liberate vitamin B12 from animal-derived proteins, allowing it to be bound by R-binder until it reaches the stomach. In the stomach, it binds with intrinsic factor and is absorbed in the ileum. What is the role of salivary gland enzymes in the absorption of vitamin B12?

1) They break down animal-derived proteins
2) They bind with intrinsic factor
3) They facilitate the absorption of vitamin B12 in the ileum
4) They liberate vitamin B12 from animal-derived proteins

Answer 1

1) Salivary gland enzymes free vitamin B12 from proteins in food, allowing it to bind with intrinsic factor later in the stomach for absorption in the ileum.

Step-by-step explanation:

The role of salivary gland enzymes in the absorption of vitamin B12 is to liberate vitamin B12 from animal-derived proteins. This action allows vitamin B12 to be initially bound by R-binder until it reaches the stomach. In the stomach, vitamin B12 is then bound with intrinsic factor, which is essential for its absorption in the ileum.

The role of salivary gland enzymes in the absorption of vitamin B12 is to liberate vitamin B12 from animal-derived proteins. Salivary gland enzymes break down the proteins in the food, releasing the vitamin B12. Once liberated, the vitamin B12 can then bind with R-binder and be transported to the stomach, where it binds with intrinsic factor and is absorbed in the ileum.