Time interval between the closure of semilunar valve and closure of $AV$ valve is (in $; s$)

The accompanying diagram shows the three stages in the cardiac cycle. Which of the following is the correct sequence?

In a typical heart,if $EDV$ is $120 \ mL$ of blood and $ESV$ is $50 \ mL$ of blood,the stroke volume $(SV)$ is:

Define a cardiac cycle and the cardiac output.

$A$: 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.

The first heart sound is associated with which of the following?