Typical 'lub-dub' sound heard in heart beat are due to

Options

A. Closing of the tricuspid and bicuspid valve
B. Blood flow through the aorta
C. Closing of the tricuspid and semilunar valves
D. Closing of the semilunar valves

Answer

C

Explanation

Lub sound is produced due to closure of bicuspid and tricuspid valve during ventricular systole and dub sound is produced due to closure of semilunar valves during ventricular diastole.