“Lub” sound produced during heart beat is caused byA. Ventricular diastoleB. Ventricular systoleC. Atrial diastoleD. Atrial systole
The "lub" sound produced during a heartbeat is caused by:
B. Ventricular systole
Explanation:
The heart sounds "lub-dub" are the two main sounds heard during each cardiac cycle.
The "lub" sound (first heart sound) occurs during ventricular systole.
Ventricular systole is the phase of the cardiac cycle when the ventricles are contracting and pumping blood out into the arteries.
The closure of the mitral (bicuspid) and tricuspid valves during ventricular systole produces the "lub" sound.
Therefore, the correct answer is B. Ventricular systole.
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