Gastrin is a(n)
a. hormone that allows glucose to enter cells.
b. enzyme that assists protein digestion.
c. hormone needed for reproductive func-tions.
d. hormone that increases the release of gas-tric juices.
D
Gastrin is a hormone that increases the release of gastric juices in response to stomach distension. The hormone that allows glucose to enter cells is insulin. Gastrin is not an enzyme, although it does stimulate secretion of gastric juices that contain enzymes. Gastrin does not have a role in reproductive functions.
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