Which of the following is not true about semilunar valves?
A) One is found at the entrance to the pulmonary trunk.
B) Their closing causes the second, shorter "dub" sound of the heartbeat.
C) They connect the atria and ventricles.
D) One is found at the entrance to the aorta.
E) They are composed of three half-moon shaped flaps.

Question

Quizplus · Accepted Answer

The semilunar valves are located in the major vessels leaving the ventricles of the heart. Composed of three half-moon shaped flaps, they prevent the backflow of blood into the heart when the heart begins to relax. Their closing causes the second heart sound or "dub." The other set of heart valves, the atrioventricular valves, are found between the atria and ventricles and their closing causes the first heart sound.

Which of the Following Is Not True About Semilunar Valves