SSC MTS EXAM

Detailed explanation-1: -The ventricles begin to contract, raising pressure within the ventricles. When ventricular pressure rises above the pressure in the two major arteries, blood pushes open the two semilunar valves and moves into the pulmonary trunk and aorta in the ventricular ejection phase.

Detailed explanation-2: -The ventricles contract and all valves are closed, so no blood can be ejected. The ventricular pressure rises considerably without any change in the ventricular blood volume – isovolumic contraction (fig.

Detailed explanation-3: -During systole, the two ventricles develop pressure and eject blood into the pulmonary artery and aorta. At this time the AV valves are closed and the semilunar valves are open. The semilunar valves are closed and the AV valves are open during diastole.