The Pulmonic and Aortic Valves

Question

The pulmonic and aortic valves
A) are atrioventricular valves.
B) "see" only oxygenated blood.
C) are attached to the ventricular walls by chordae tendineae.
D) are semilunar valves.

Accepted Answer

The pulmonic and aortic valves are semilunar valves that separate the ventricles from the pulmonary artery and aorta, respectively. They prevent the backflow of blood into the ventricles when they relax. A and C are incorrect as the pulmonic and aortic valves are not atrioventricular valves and are not attached to the ventricular walls by chordae tendineae. B is incorrect as the aortic valve "sees" both oxygenated and deoxygenated blood.