What salivary protein is important for the transport of dietary vitamin B12 to the small intestine?
a. Trypsin
b. IF
c. Haptocorrin
d. Transcobalamin II
ANS: C
Haptocorrin is a salivary protein that binds vitamin B12 found in food. In the small intestine the vitamin is released from haptocorrin by the action of trypsin. IF is then required for its absorption into circulation. Transcobalamin is the most important of the plasma carrier proteins for vitamin B12.
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