A) ventricular diastole
B) ventricular systole
C) atrial diastole
D) atrial systole
Correct Answer: B
Solution :
Lubb (\[{{S}_{1}}\], first sound, systolic sound) is the first heart sound which is louder or low pitched, of long duration (0.16-0.19 seconds) and is produced due to closure of atrioventricular valves (tricuspid and bicuspid) during ventricular systole.
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