The valve between the left atrium and ventricle is the:

• A. Pulmonary
• B. Tricuspid
• C. Aortic
• D. Bicuspid

Answer: (D)

The valve between the left atrium and the left ventricle is the bicuspid (mitral) valve. This left atrioventricular valve has two leaflets (cusps) and allows blood to flow from the left atrium into the left ventricle, while preventing backflow when the ventricle contracts. In contrast, the tricuspid valve sits on the right side between the right atrium and right ventricle, and the aortic and pulmonary valves are semilunar valves between the ventricles and their great arteries, each with three cusps.