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
Correct Answer: A
Solution :
First sound of heart is lubb (a long and booming sound), created by the closure of atrioventricular valves (AV), tricuspid and bicuspid at the beginning ofventricular systole. The second sound of heart is *dupp-a short and sharp sound. The instrument used to hear heart sound is stethoscope.
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