What causes the sounds that one hears as the heart beats?
A) the turbulence created as the valves close
B) the turbulence created as the valves open
C) the bulk movement of blood into and out of the ventricle
D) the snapping of the valves into the open position
E) the snapping of the valves into a closed position

Question

Quizplus · Accepted Answer

The sounds of the heart, often described as "lub-dub," are primarily caused by the turbulence created when the heart valves close. The "lub" is the sound of the atrioventricular valves (mitral and tricuspid) closing, and the "dub" is the sound of the semilunar valves (aortic and pulmonary) closing.

What Causes the Sounds That One Hears as the Heart