When _____________, blood pressure within the ventricles increases, which causes the AV valves to close and the semilunar valves to open.

Question

Quizplus · Accepted Answer

When the ventricles contract (ventricular systole) and the atria relax, the pressure in the ventricles rises above the pressure in the atria, causing the atrioventricular (AV) valves to close to prevent backflow of blood into the atria. As the pressure in the ventricles continues to rise, it eventually exceeds the pressure in the arteries, leading to the opening of the semilunar valves, allowing blood to be ejected into the aorta and pulmonary artery.

When _____________, Blood Pressure Within the Ventricles Increases, Which Causes