Why can a completely dry food bolus NOT be swallowed?
a. the dry food stimulates sympathetic activity, inhibiting peristalsis
b. the dry food inhibits parasympathetic activity in the esophagus
c. friction with the walls of the esophagus makes peristalsis ineffective
d. all of the listed responses are correct
Answer: c. friction with the walls of the esophagus makes peristalsis ineffective
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