Which valve sits between the left ventricle and the aorta?

Which valve sits between the left ventricle and the aorta?

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

Answer: (B)

The aortic valve is the valve between the left ventricle and the aorta. It’s a three-cusped semilunar valve that opens to allow blood to flow from the left ventricle into the aorta during ventricular contraction and closes during relaxation to prevent backflow into the ventricle. This distinguishes it from the pulmonary semilunar valve, which sits between the right ventricle and the pulmonary artery; the mitral valve, between the left atrium and left ventricle; and the tricuspid valve, between the right atrium and right ventricle.

The aortic valve is the valve between the left ventricle and the aorta. It’s a three-cusped semilunar valve that opens to allow blood to flow from the left ventricle into the aorta during ventricular contraction and closes during relaxation to prevent backflow into the ventricle. This distinguishes it from the pulmonary semilunar valve, which sits between the right ventricle and the pulmonary artery; the mitral valve, between the left atrium and left ventricle; and the tricuspid valve, between the right atrium and right ventricle.