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Which one of the following is a matching...

Which one of the following is a matching pair ?

A

Lubb-Sharp closure of AV valves at the beginning of ventricular systole

B

Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole

C

Pulsation of the radial artery-valves in the blood vessels

D

Initiation of the heart beat-Purkinje fibres

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The correct Answer is:
A
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