Which valves are located between the atria and ventricles of the heart?

The valves located between the atria and ventricles of the heart are the tricuspid and bicuspid (or mitral) valves. These valves play a crucial role in ensuring unidirectional blood flow through the heart's chambers.

The tricuspid valve is situated between the right atrium and the right ventricle, while the bicuspid valve, also known as the mitral valve, is found between the left atrium and the left ventricle. During the contraction of the atria, these valves open to allow blood to flow into the ventricles. When the ventricles contract, the valves close to prevent backflow of blood into the atria, which is essential for maintaining effective circulation.

In contrast, the other options refer to different types of valves that do not separate the atria from the ventricles. The venous and pulmonary valves are not standard terms used in this context; the terms aortic and mitral valves pertain to different structures, including the aortic valve, which is found between the left ventricle and the aorta, and the semilunar valves are located at the openings of the ventricles to the pulmonary trunk and aorta. Thus, the tricuspid and bic