During ventricular systole (contraction) :

A) the ventricles relax.
B) blood flows from the ventricles into the atria.
C) the tricuspid and mitral valves are open.
D) blood flows from the ventricles to the pulmonary artery and aorta.
E) the atria contract.

Ventricular Systole

The phase of the cardiac cycle during which the ventricles contract, pumping blood out of the heart into the arteries.

Pulmonary Artery

The artery that carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.

Aorta

The largest and main systemic artery of the vertebrate body; arises from the left ventricle and branches to distribute blood to all parts of the body except the lungs.