What causes food to enter the stomach once it has reached the esophagus?
a. Gravity
b. Peristaltic contractions
c. Contraction of the cricopharyngeal muscle
d. The release of somatostatin, which causes the stomach to contract and accept food
B
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A Gravity does not cause food to be propelled from the esophagus into the stomach.
B Peristaltic contractions cause food to be propelled from the esophagus into the stomach.
C Contraction of the cricopharyngeal muscle causes food to be propelled through the esophageal sphincter.
D The release of somatostatin and gastrin regulates the secretion of acid and pepsin in the stomach.
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