Where is the tricuspid valve located?

• A. Between the right atrium and right ventricle; it has three leaflets
• B. Between the right atrium and left ventricle; two leaflets
• C. Between the left atrium and left ventricle; two leaflets
• D. Between the left ventricle and the aorta; three leaflets

Answer: (A)

The tricuspid valve is the right-sided atrioventricular valve, sitting between the right atrium and the right ventricle. It has three leaflets (cusps)—anterior, septal, and posterior. Its job is to open to allow blood to flow from the atrium into the ventricle during filling, and then close during contraction to prevent blood from flowing back into the atrium.

This helps explain why the correct choice is that location and leaflet count. The valve between the right atrium and left ventricle would be misplaced for the right side and is not the tricuspid; that left-sided valve is the mitral (bicuspid) valve, which has two leaflets. The valve between the left ventricle and the aorta is the aortic valve, a semilunar valve with three cusps, not the tricuspid.