The sphincter muscle at the top of the esophagus is called

A. epiglottis.
B. lower esophageal sphincter.
C. upper esophageal sphincter.
D. gastroesophageal sphincter.


Answer: B

Nutritional Science

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a. vitamin C b. thiamin c. riboflavin d. biotin e. vitamin D

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What will be an ideal response?

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