In humans, blood returning to the heart from the head encounters heart valves in the following order _______ before entering the aorta.
A. bicuspid>semilunar>tricuspid>semilunar
B. tricuspid>semilunar>bicuspid>semilunar
C. semilunar>bicuspid>semilunar>tricuspid
D. semilunar>tricuspid>semilunar>bicuspid
Answer: B. tricuspid>semilunar>bicuspid>semilunar
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