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9 years ago
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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venuskyvenusky
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8 years ago
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...hello Author
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9 years ago
Thanks for your help!!
Zacellison
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Yesterday
Brilliant ツ
wyq2651
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2 hours ago
Good timing, thanks!
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