Which valve exits the left ventricle into the aorta?

Which valve exits the left ventricle into the aorta?

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

Answer: (A)

Blood leaves the left ventricle to enter the systemic circulation through the aortic valve, which is the aortic (semilunar) valve. This valve sits between the left ventricle and the ascending aorta and opens during systole to allow ejection of blood, then closes to prevent backflow during diastole. The other valves have different roles: the pulmonic valve sits between the right ventricle and the pulmonary artery, while the tricuspid and mitral valves regulate blood flow between the atria and ventricles. The aortic valve’s location and function specifically match the exit pathway from the left ventricle into the aorta.

Blood leaves the left ventricle to enter the systemic circulation through the aortic valve, which is the aortic (semilunar) valve. This valve sits between the left ventricle and the ascending aorta and opens during systole to allow ejection of blood, then closes to prevent backflow during diastole. The other valves have different roles: the pulmonic valve sits between the right ventricle and the pulmonary artery, while the tricuspid and mitral valves regulate blood flow between the atria and ventricles. The aortic valve’s location and function specifically match the exit pathway from the left ventricle into the aorta.