In humans,the duration of a cardiac cycle is ......... seconds.

The duration of the ventricular diastole in a normal cardiac cycle is

Which would be the heart rate of a person if the cardiac output is $5 \; L,$ blood volume in the ventricles at the end of diastole is $100 \; mL$ and at the end of ventricular systole is $50 \; mL?$

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second heart sound is heard when:

What is the contraction of the heart called?

$A$: Isovolumetric systole of a normal cardiac cycle is responsible for the opening of semilunar valves causing the blood flow into aortic aorta and pulmonary aorta.
$R$: During isovolumetric systole,intraventricular pressure increases as semilunar and $AV$ valves are closed and ventricles are contracting.