When ventricles ________, the AV valves are closed.

Name: When ventricles ________, the AV valves are closed.
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When the ventricles contract (also known as systole), the pressure within the chamber increases, causing the AV valves (tricuspid and mitral valves) to close. This prevents blood from flowing back into the atria and instead forces it out through the aortic and pulmonary valves, into the respective arteries.

When Ventricles ________, the AV Valves Are Closed