Which valve directs blood from the right ventricle into the pulmonary artery?

Which valve directs blood from the right ventricle into the pulmonary artery?

• A. Pulmonic semilunar valve
• B. Aortic semilunar valve
• C. Tricuspid valve
• D. Mitral valve

Answer: (A)

The valve that directs blood from the right ventricle into the pulmonary artery is the pulmonic (pulmonary) semilunar valve. It sits at the outflow of the right ventricle and opens during systole to allow deoxygenated blood to flow to the lungs, then closes in diastole to prevent backflow into the ventricle. In contrast, the tricuspid valve sits between the right atrium and right ventricle, the mitral valve sits between the left atrium and left ventricle, and the aortic semilunar valve sits at the outflow of the left ventricle into the aorta.

The valve that directs blood from the right ventricle into the pulmonary artery is the pulmonic (pulmonary) semilunar valve. It sits at the outflow of the right ventricle and opens during systole to allow deoxygenated blood to flow to the lungs, then closes in diastole to prevent backflow into the ventricle.

In contrast, the tricuspid valve sits between the right atrium and right ventricle, the mitral valve sits between the left atrium and left ventricle, and the aortic semilunar valve sits at the outflow of the left ventricle into the aorta.