What causes the cardiac valves to open and close?

Question

Quizplus · Accepted Answer

Pressure changes in the cardiac chambers cause the valves to open and close. The pressure changes occur as the heart contracts and relaxes, causing blood to be pushed or pulled through the valves. The valves open to allow blood to flow through and then close to prevent backflow. The chordae tendineae and papillary muscles help to support and stabilize the valves, but they are not directly responsible for opening and closing them. The walls of the heart's chambers do stretch and send nervous impulses, but this is not the primary mechanism for valve function.

What Causes the Cardiac Valves to Open and Close