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Ventricles Wave Excitation Node Causing Contract Describe Happening

Front Describe what is happening in the heart at each stage of an ECG.
Back
ECG stages:
  • P-wave - wave of excitation spreads over both atria from SA node causing the atrial muscles to contract
  • PR segment - delay at AV node to allow filling of ventricles
  • QRS complex - wave of excitation spreading up walls of ventricles from the apex, causing ventricles to contract
  • T wave - ventricles repolarise after which - ventricular diastole




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