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) Purkinje fibers - Initiation of the heartbeat.
Correct Answer: A
Solution :
[a] Lubb sound is caused partly by the closure of the bicuspid and tricuspid valves and partly by the contraction of the muscles in the ventricles. Lubb is the first heart sound.
You need to login to perform this action.
You will be redirected in
3 sec
