In the right side of the heart, which valve opens to allow blood to move from the ventricle to the pulmonary artery?

In the right side of the heart, which valve opens to allow blood to move from the ventricle to the pulmonary artery?

• A. Tricuspid valve
• B. Pulmonary semilunar valve
• C. Aortic valve
• D. Left AV valve

Answer: (B)

When the right ventricle contracts, it needs to push blood into the pulmonary artery. The valve that opens to allow this outflow is the pulmonary semilunar valve. It sits at the junction of the right ventricle and the pulmonary trunk and opens during systole to permit blood to flow toward the lungs, then closes during diastole to prevent backflow. This valve is a semilunar valve with cusps that fill with blood to close, and it operates differently from the atrioventricular valves, which have chordae tendineae and papillary muscles. The tricuspid valve is between the right atrium and right ventricle, not at the outflow to the pulmonary artery. The aortic valve handles outflow from the left ventricle to the aorta, and the left AV valve (mitral) is between the left atrium and left ventricle.

When the right ventricle contracts, it needs to push blood into the pulmonary artery. The valve that opens to allow this outflow is the pulmonary semilunar valve. It sits at the junction of the right ventricle and the pulmonary trunk and opens during systole to permit blood to flow toward the lungs, then closes during diastole to prevent backflow.

This valve is a semilunar valve with cusps that fill with blood to close, and it operates differently from the atrioventricular valves, which have chordae tendineae and papillary muscles. The tricuspid valve is between the right atrium and right ventricle, not at the outflow to the pulmonary artery. The aortic valve handles outflow from the left ventricle to the aorta, and the left AV valve (mitral) is between the left atrium and left ventricle.