In a diagnostic test, a gastroenterologist uses an endoscope to deliver a bolus of dilute acid into the distal esophagus
The bolus is sufficient to cause esophageal dilatation. In a normal individual, the bolus will be cleared from the esophagus predominantly by which of the following?
A. primary peristalsis
B. swallowing
C. secondary peristalsis
D. relaxation of the upper esophageal sphincter
E. receptive relaxation
F. gravity
ANS: C
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