Acid reflux into the esophagus ("heartburn") is normally prevented by ________
A) pharyngeal and buccal sphincters
B) esophageal glands
C) the lower esophageal sphincter (LES)
D) the upper esophageal sphincter
E) pharyngeal constrictors
C
Anatomy & Physiology
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Paranasal sinuses are located within which of the following bones? 1. frontal bone 2. sphenoid 3. ethmoid 4. maxilla 5. nasal bone
A) 1, 2, 3, 4, 5 B) 1, 2, 3, 4 C) 1, 3, 5 D) 1, 2, 3 E) 3, 4, 5
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