Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
The first heart sound 'lubb? (1) marks the beginning of ventricular systole (2) marks the end of ventricular systole (3) is due to closure of atrioventricular valves (4) is produced by the closure of semilunar valvesA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: D
Solution :
Each heart beat is accompanied by two heart sounds. The first heart sound of 'lubb' marks the beginning of ventricular systole and is due to closure of atrioventricular valves. The second heart sound of 'dupp' marks the end of ventricular systole and beginning of its diastole. It is produced by the closure of semilunar valves.
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