The upper third of the esophagus has skeletal muscle in its wall. What are some possible advantages of this fact?
A. The first phase of swallowing is involuntary.
B. Peristalsis will not be necessary, and will not occur.
C. The final phase of swallowing is voluntary.
D. The bolus can clear the upper esophagus quickly.
Answer: D
Anatomy & Physiology
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