Atrioventricular valves

These valves close the ventricles against the atria during their contraction. They thus act as valves for the blood between the atrium and the ventricle.

In the right heart there is the tricuspid valve with three cusps, in the left heart there is the bicuspid mitral valve with two cusps.

https://en.wikipedia.org/wiki/Heart_valve _([1])