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Acid reflux into the esophagus ("heartburn") is normally prevented by


A) pharyngeal constrictors.
B) the upper esophageal sphincter.
C) the lower esophageal sphincter (LES) .
D) esophageal glands.
E) pharyngeal and buccal sphincters.

F) B) and C)
G) A) and E)

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The large intestine is longer than the small intestine.

A) True
B) False

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