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Typical 'lubb-dupp' sounds heard during heartbeat are due to :
(A) Closing of bicuspid and tricupid valves
(B) Closing of semilunar valves
(C) Blood under pressure through aorta
(D) Closure of bicuspid-tricuspid valves followed by semilunar valves
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Answer:
option D...!!!!!!!!!!
Answered by
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right answer is option D....
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