Which of the Following Sphincters Is Composed of Skeletal Muscle

question 37

Multiple Choice

Which of the following sphincters is composed of skeletal muscle?

• A) pyloric sphincter only
• B) upper esophageal sphincter only
• C) external anal sphincter only
• D) both the pyloric and upper esophageal sphincters
• E) both the upper esophageal and external anal sphincters

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