Why Does the Superior Part of the Esophagus Contain Skeletal

question 217

Multiple Choice

Why does the superior part of the esophagus contain skeletal muscle instead of smooth muscle?

• A) The first phase of swallowing is under involuntary control.
• B) The second phase of swallowing is under voluntary control.
• C) The first phase of swallowing is under voluntary control.
• D) The second phase of swallowing is under involuntary control.

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