Heart Beat

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Heart Beat

  • The contraction of the heart is myogenic - the signal for cardiac compression arises within the heart tissue itself.
    • the signal for a heart beat is initiated by the heart muscle cells (cardiomyocytes) rather than brain cells.
  • Within the wall of the right atrium are a specialised cluster of cardiomyocytes which direct the contraction of heart muscle tissue.
    • cluster of cells collectively known as the sinoatrail node (SAN).
  • The sinoatrial node acts as the primary pacemaker - controlling the rate at which the heart beats 
    • triggers roughly 60-100 cardiac contractions per minute
    • if the SAN fails, the AV node (secondary pacemaker) may maintain cardiac contractions at…

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