Multiple Choice
The upper esophageal sphincter is composed of a circular band of skeletal muscle. The lower esophageal sphincter is composed of a circular band of smooth muscle.
A) Both statements are true.
B) Both statements are false.
C) The first statement is true; the second is false.
D) The second statement is true; the first is false.
Correct Answer:
Verified
Correct Answer:
Verified
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