What are the types of atrioventricular valves?

What are the types of atrioventricular valves?

• A. Tricuspid valve (between right atrium and right ventricle) and mitral/bicuspid valve (between left atrium and left ventricle)
• B. Aortic valve and pulmonary valve
• C. Tricuspid valve and aortic valve
• D. Mitral valve and pulmonary valve

Answer: (A)

The main idea here is identifying which valves belong to the atrioventricular (AV) group. AV valves are located between each atrium and its ventricle and open to let blood flow from the atria into the ventricles, then close to prevent backflow during ventricular contraction. The two AV valves are the tricuspid valve, between the right atrium and right ventricle, and the mitral valve (also called the bicuspid valve), between the left atrium and left ventricle. The mitral valve is often called bicuspid because it typically has two leaflets. The other valves described in the options—the aortic valve and the pulmonary valve—are semilunar valves, located between the ventricles and the great arteries, not between an atrium and a ventricle. So they do not count as atrioventricular valves.

The main idea here is identifying which valves belong to the atrioventricular (AV) group. AV valves are located between each atrium and its ventricle and open to let blood flow from the atria into the ventricles, then close to prevent backflow during ventricular contraction.

The two AV valves are the tricuspid valve, between the right atrium and right ventricle, and the mitral valve (also called the bicuspid valve), between the left atrium and left ventricle. The mitral valve is often called bicuspid because it typically has two leaflets.

The other valves described in the options—the aortic valve and the pulmonary valve—are semilunar valves, located between the ventricles and the great arteries, not between an atrium and a ventricle. So they do not count as atrioventricular valves.