Question

During ventricular systole, the atrioventricular valves (P) ______ and semilunar valves (Q) ______.

Options

• P - Close, Q - Open

• P - Close, Q - Close

• P - Open, Q - Close

• P - Open, Q - Open

Answer 1

During ventricular systole, the atrioventricular valves (P) close and semilunar valves (Q) open.

Explanation:

During ventricular systole, the ventricles contract to remove blood from the heart.

• The atrioventricular (AV) valves (P) close to prevent blood from backflowing into the atria.
• The semilunar valves (Q) open, allowing blood to flow into the arteries (aorta and pulmonary).