Starting at the right atrium, which valve immediately guards the flow into the right ventricle?

Starting at the right atrium, which valve immediately guards the flow into the right ventricle?

• A. Tricuspid valve
• B. Mitral valve
• C. Aortic valve
• D. Pulmonary valve

Answer: (A)

The valve that sits between the right atrium and the right ventricle is the tricuspid valve. It acts as the right atrioventricular valve, opening to allow blood to flow from the atrium into the ventricle during filling, and closing during ventricular contraction to prevent backflow into the atrium. The other valves are located at different junctions: the mitral valve between the left atrium and left ventricle, the aortic valve at the outflow from the left ventricle to the aorta, and the pulmonary valve at the outflow from the right ventricle to the pulmonary artery.

The valve that sits between the right atrium and the right ventricle is the tricuspid valve. It acts as the right atrioventricular valve, opening to allow blood to flow from the atrium into the ventricle during filling, and closing during ventricular contraction to prevent backflow into the atrium. The other valves are located at different junctions: the mitral valve between the left atrium and left ventricle, the aortic valve at the outflow from the left ventricle to the aorta, and the pulmonary valve at the outflow from the right ventricle to the pulmonary artery.