The inferior end of the esophagus normally remains in a state of active contraction that __________.
a. prevents the back flow of materials from the stomach into the esophagus
b. prevents air from entering into the esophagus
c. allows food to move rapidly into the stomach
d. initiates the movement of food from the stomach into the small intestine
Ans: a. prevents the back flow of materials from the stomach into the esophagus
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