1.

Find the matching pair :

A. Lubb- sharp closure of AV valves at beginning of ventricular systole
B. Dub - sudden opening of semilunar valves at the beginning of ventricular systole
C. Pulsation of radial artery valves in blood vessels
D. Initiation of heart beat - Purkinje fibers
Answer» D. Initiation of heart beat - Purkinje fibers


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