What causes the sounds that are normally heard when listening to the heart through a stethoscope?
A) Contraction of the heart muscle
B) Closing of the heart valves
C) Blood flowing through blood vessels
D) The heart does not make any noise.

Question

Quizplus · Accepted Answer

The sounds heard through the stethoscope are caused by the closing of the heart valves. These sounds are known as the "lub-dub" sound of the heart.

What Causes the Sounds That Are Normally Heard When Listening