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

$A$: 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.

What is the end diastolic volume $(EDV)$ of blood in a normal adult heart (in $,ml$)?

The first heart sound '$Lubb$' occurs in which phase of the cardiac cycle?

Which of the following stages in the cardiac cycle is of the longest duration $:-$

Calculate the cardiac output of an individual having $70$ heart beats/min with a stroke volume of $55 \ mL$.