Which valve ejects blood from the left ventricle into the aorta?

Which valve ejects blood from the left ventricle into the aorta?

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

Answer: (A)

Blood ejected from the left ventricle into the aorta flows through the aortic semilunar valve. This valve sits at the outflow tract of the left ventricle and opens during systole to allow ejection, then closes during diastole to prevent backflow into the ventricle. It’s a semilunar valve with three cusps that coapt to seal the opening when closed. The pulmonic semilunar valve serves the right heart, regulating flow from the right ventricle to the pulmonary artery. The mitral valve is the left atrioventricular valve between the left atrium and ventricle, and the tricuspid valve is the right atrioventricular valve between the right atrium and ventricle.