What valve lies between the left ventricle and the aorta?

What valve lies between the left ventricle and the aorta?

• A. Aortic semilunar
• B. Pulmonary semilunar
• C. Tricuspid
• D. Bicuspid

Answer: (A)

Between the left ventricle and the aorta sits the aortic semilunar valve. It has three cusps that form pocket-like openings. When the left ventricle contracts, pressure pushes the cusps open to push blood into the aorta. As the ventricle relaxes, the aorta's elasticity and the cusps closing prevent blood from flowing back into the ventricle. This arrangement ensures one-way, high-pressure blood flow into the systemic circulation during systole and prevents backflow during diastole. The other valves are located elsewhere: the semilunar valve between the right ventricle and the pulmonary artery, the tricuspid valve between the right atrium and right ventricle, and the mitral (bicuspid) valve between the left atrium and left ventricle.

Between the left ventricle and the aorta sits the aortic semilunar valve. It has three cusps that form pocket-like openings. When the left ventricle contracts, pressure pushes the cusps open to push blood into the aorta. As the ventricle relaxes, the aorta's elasticity and the cusps closing prevent blood from flowing back into the ventricle. This arrangement ensures one-way, high-pressure blood flow into the systemic circulation during systole and prevents backflow during diastole. The other valves are located elsewhere: the semilunar valve between the right ventricle and the pulmonary artery, the tricuspid valve between the right atrium and right ventricle, and the mitral (bicuspid) valve between the left atrium and left ventricle.