Which valve is located between the right atrium and right ventricle?

Which valve is located between the right atrium and right ventricle?

• A. Tricuspid (R AV valve)
• B. Bicuspid (mitral) (L AV valve)
• C. Pulmonary semilunar
• D. Aortic semilunar

Answer: (A)

The main concept here is identifying which valve sits between the right atrium and the right ventricle. That valve is the tricuspid valve, the right atrioventricular valve. It has three cusps and opens to allow blood to move from the right atrium into the right ventricle during diastole. When the ventricle contracts, this valve closes to prevent backflow into the atrium, with the help of chordae tendineae and papillary muscles. For context, the mitral valve (bicuspid) sits between the left atrium and left ventricle, while the semilunar valves—the pulmonary semilunar valve and the aortic semilunar valve—are between the ventricles and the arteries (pulmonary artery and aorta, respectively) and do not lie between an atrium and a ventricle.

The main concept here is identifying which valve sits between the right atrium and the right ventricle. That valve is the tricuspid valve, the right atrioventricular valve. It has three cusps and opens to allow blood to move from the right atrium into the right ventricle during diastole. When the ventricle contracts, this valve closes to prevent backflow into the atrium, with the help of chordae tendineae and papillary muscles.

For context, the mitral valve (bicuspid) sits between the left atrium and left ventricle, while the semilunar valves—the pulmonary semilunar valve and the aortic semilunar valve—are between the ventricles and the arteries (pulmonary artery and aorta, respectively) and do not lie between an atrium and a ventricle.