The left atrioventricular valve is also known as the bicuspid valve.

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

Answer: (A)

The left atrioventricular valve is the bicuspid valve because it has two cusps (leaflets) that control blood flow from the left atrium to the left ventricle and prevent backflow when the ventricle contracts. It’s also commonly called the mitral valve. This distinguishes it from the right atrioventricular valve, which is the tricuspid valve and has three cusps. The semilunar valves at the outflow tracts—pulmonary and aortic—also differ, as they have three cusps and sit at the exits of the ventricles into the pulmonary artery and aorta, not between an atrium and ventricle.