Q.

Secondary esophageal peristalsis:

A. Is preceded by an oral- pharyngeal phase of Swallowing .
B. Involves activation of medullary Swallowing centers .
C. Is accompanied by lower esophageal sphincter relaxation.
D. Occurs in both skeletal and smooth muscle portions of the esophagus.
Answer» C. Is accompanied by lower esophageal sphincter relaxation.
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