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Select the correct pair regarding cardiac cycle

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

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

Closure of semilunar valves : Prevent back ward of flow of blood into atria

Purkinje fibers : Natural pace maker

answer is C.

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Detailed Solution

Dupp sound occurs due to closure of semilunar valves.
SAN is pace maker.
Semilunar valves are closed to prevent backward flow of blood into ventricles.

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