Through which valve does blood exit the right atrium?

Through which valve does blood exit the right atrium?

• A. Bicuspid valve
• B. Aortic valve
• C. Right AV (Tricuspid) valve
• D. Pulmonary valve

Answer: (C)

Blood leaves the right atrium by passing through the right atrioventricular valve, also known as the tricuspid valve. This valve sits between the right atrium and the right ventricle and opens when the atrium contracts, allowing blood to flow into the ventricle, then closes during ventricular contraction to prevent backflow. The other valves are located at different relationships: the bicuspid (mitral) valve is between the left atrium and left ventricle; the aortic valve is between the left ventricle and the aorta; and the pulmonary valve is between the right ventricle and the pulmonary artery.

Blood leaves the right atrium by passing through the right atrioventricular valve, also known as the tricuspid valve. This valve sits between the right atrium and the right ventricle and opens when the atrium contracts, allowing blood to flow into the ventricle, then closes during ventricular contraction to prevent backflow. The other valves are located at different relationships: the bicuspid (mitral) valve is between the left atrium and left ventricle; the aortic valve is between the left ventricle and the aorta; and the pulmonary valve is between the right ventricle and the pulmonary artery.