The aortic semilunar valve prevents blood from flowing backwards into the
A. left atrium.
B. right ventricle.
C. right atrium.
D. left ventricle.
Answer: D
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A. a, b, c, d B. c, b, a, d C. b, c, d, a D. a, b, d, c E. e, c, , a, b
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