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Question

Pulmonary semilunar valves are closed during __________ systole.


A

atrial

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B

discontinuous

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C

ventricular

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D

continuous

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Solution

The correct option is A

atrial


During atrial systole, blood enters the ventricles through bicuspid and tricuspid valves. Pulmonary semilunar valves close to prevent the back flow of the blood into the ventricles. This closure produces a 'Dub' sound which is the sound heard on placing a stethoscope onto the chest and listening.


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