17.Typical lub-dub' sounds heard during heartbeat are due to:
A Closing of Semilunar valves
B Blood under pressure through aorta
C Closing of bicuspid and tricuspid valves
D. Closure of bicuspid-tricuspid valves followed by Semilunar valves
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Closure of bicuspid-tricuspid valves followed by Semilunar valves
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