What causes the AV (atrioventricular) valves within the heart to open during the cardiac cycle?
A)pressure generated by ventricular muscle contraction
B)an action potential
C)fluid pressure from the atria filling with blood
D)a pacemaker signal
E)arterial blood pressure

Question

Quizplus · Accepted Answer

The AV valves open due to fluid pressure from the atria filling with blood. As the atria contract and fill with blood, the pressure in the atria increases and pushes open the AV valves, allowing blood to flow into the ventricles.

What Causes the AV (Atrioventricular) Valves Within the Heart to Open