Given below are two statements:
Statement (I): During ventricular systole, cuspid valves close both atrioventricular apertures, preventing blood flow into atria.
Statement (II): During ventricular diastole, semilunar valves are closed, preventing backflow of blood from pulmonary trunk and systemic aorta into ventricles.
In light of above statements, choose most appropriate answer from options given below.

During ventricular systole, the ventricles contract, leading to an increase in ventricular pressure. This causes the closure of the tricuspid and bicuspid (cuspid) valves to prevent the backflow of blood into the atria. Thus, Statement (I) is correct.

During ventricular diastole, the ventricles relax and the ventricular pressure falls. This causes the closure of the semilunar valves, which prevents the backflow of blood from the pulmonary artery (trunk) and the systemic aorta into the right and left ventricles, respectively. Thus, Statement (II) is correct.

Both Statement (I) and Statement (II) are correct.

Answer: Both (I) and (II) are correct.