Which valve does blood pass through immediately after leaving the right atrium?

Which valve does blood pass through immediately after leaving the right atrium?

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

Answer: (A)

Blood returning to the heart from the body first passes through the tricuspid valve, which sits between the right atrium and the right ventricle. This valve opens to allow blood to move from the right atrium into the right ventricle and closes to prevent backflow. The other valves are located elsewhere: the mitral valve is between the left atrium and left ventricle, the pulmonary valve sits at the outflow from the right ventricle to the pulmonary artery, and the aortic valve is between the left ventricle and the aorta.

Blood returning to the heart from the body first passes through the tricuspid valve, which sits between the right atrium and the right ventricle. This valve opens to allow blood to move from the right atrium into the right ventricle and closes to prevent backflow. The other valves are located elsewhere: the mitral valve is between the left atrium and left ventricle, the pulmonary valve sits at the outflow from the right ventricle to the pulmonary artery, and the aortic valve is between the left ventricle and the aorta.