Question

What are the heart sounds? When and how are these sounds produced?

Answer 1

• The heart produces a characteristic sound at the beginning and at the end of the ventricular systole or contraction.
• The sounds produced are “lub-DUB”, lub being the first of the two.
  
• The lub is the sound produced by the closure of the tricuspid and mitral valves.
• The dub is the sound produced by the closure of the aortic and pulmonary valves.