Respuesta :
tricuspid and mitral valves
Explanation:
is caused by the closing of the valves leading to the ventricles
This sound comes from the valves shutting on the blood inside the heart.
What causes the lub-dub heart sounds that are heard with a stethoscope?
The heart has four valves that act like the paper squares. They open and close allowing blood to flow through the heart in only one direction.
What does the lub dub sound mean?
“lub-dub” is the sound of the mitral and tricuspid valves closing. The second “lub-dub” is the sound of the aortic and pulmonary valves closing soon after.
To learn more about lub sound, here
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