1.

Which one of the following is a matching pairA. Lub-sharp closure of AV valves at beginning of ventricular systoleB. Dub-sudden opening of semilunar valves at the beginning of ventricular systoleC. Pulsation of radial artery-valves in blood vesselsD. Initiantion of heart beat-Purkinje fibres

Answer» Correct Answer - A
Lub is due to sharp closure of AV valves at beginning of ventricular systole.


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