Question

Whenever we use a stethoscope, we hear a lub-dub sound from the heart. How is it produced?

Answer 1

Answer:

Explanation:

Normally, two distinct sounds are heard through the stethoscope: a low, slightly prolonged “lub” (first sound) occurring at the beginning of ventricular contraction, or systole, and produced by closure of the mitral and tricuspid valves, and a sharper, higher-pitched “dup” (second sound), caused by closure of aortic