How much does the atrial pressure rise during atrial contraction in $mm\,Hg$?

Identify the correct sequence of the cardiac cycle.

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

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.

Cardiac cycle is a cyclic event that occurs in