____ is a circular muscle that acts as a valve, opening and closing to allow the gastric contents to move throughout the GI tract.
a) Connective tissue
b) The lumen
c) A sphincter
d) The rectum
Ans: c) A sphincter
Nutritional Science
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Indicate whether the statement is true or false
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A. B. Parity C. D. E. F. G. Gravida H. I. J.
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