In which stage of cardiac cycle does the first sharp sound of the heart can be heard?

Contraction of atria

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Relaxation of atria

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Contraction of ventricles

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Relaxation of ventricles

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Solution

The correct option is C Contraction of ventricles
On ventricular contraction, due to pressure, the blood moves into the aorta and pulmonary artery. The aperture between the atria and ventricles are closed by valves. When the valves are closed forcibly, the first sharp sound of the heart 'lub' can be heard. It is caused by the closure of mitral and tricuspid valves at the start of systole. 'Dub' sound is produced by the closure of aortic and pulmonary valves, marking the end of systole.

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