The cardiac cycle

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The cardiac cycle: The cradiac cycle is a sequence of events in one heartbeat

Sequence of contraction

Filling phase

  • Both atria & ventricles are relaxing
  • Internal volume increases & blood flows into heart from the major veins
  • Blood flows into atria- then through open atrioventicular valves & into ventricles
  • This phase is called diastole

Atrial contraction

  • Heart beat starts when atria contract- left & right contract together
  • small increase in pressure (from contraction)- helps


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