Third Heart Sound in Diastole
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Questions and Answers

Which heart sound is described as weak and rumbling, occurring at the beginning of the middle third of diastole?

  • First heart sound (S1)
  • Third heart sound (S3) (correct)
  • Fourth heart sound (S4)
  • Second heart sound (S2)

    • Why does the third heart sound not occur until the middle third of diastole?

  • The ventricles are not filled sufficiently in the early part of diastole (correct)
  • The ventricles are not contracting properly in the early part of diastole
  • The atria are not filled sufficiently in the early part of diastole
  • The atria are not contracting properly in the early part of diastole

    • Why can the third heart sound often be recorded in the phonocardiogram even though it is usually too low to be heard by the ear?

  • The phonocardiogram distorts low-frequency sounds
  • The phonocardiogram reduces low-frequency sounds
  • The phonocardiogram filters out high-frequency sounds
  • The phonocardiogram amplifies low-frequency sounds (correct)

    • What is the reason that the third heart sound does not occur until the middle third of diastole?

    <p>The ventricles are not filled sufficiently in the early part of diastole to create elastic tension necessary for reverberation</p> Signup and view all the answers

    Why is the third heart sound usually too low to be heard by the ear?

    <p>The frequency of the sound is usually so low that the ear cannot hear it</p> Signup and view all the answers

    Why can the third heart sound often be recorded in the phonocardiogram even though it is usually too low to be heard by the ear?

    <p>The phonocardiogram is more sensitive to low-frequency sounds than the human ear</p> Signup and view all the answers

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