A circular muscle that can open and close and acts to regulate the flow of materials in one direction is referred to as ________.
A. peristalsis
B. a pump
C. enterohepatic circulation
D. a sphincter
Answer: D
Nutritional Science
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a. true b. false
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Which of the following is NOT a component of physical fitness?
What will be an ideal response?
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In what ways do female and male bodies change during puberty?
What will be an ideal response?
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