The atrioventricular valves permit blood flow

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The atrioventricular valves, also known as the AV valves, permit blood flow in one direction only. These valves separate the atria and ventricles, and when pressure is higher in the atria, the valves open to allow blood to flow into the ventricles. When pressure is higher in the ventricles, the valves close to prevent backflow of blood into the atria. This ensures that blood flows in one direction through the heart.

The Atrioventricular Valves Permit Blood Flow