The Heart GCSE Biology revison.

  • Created by: ilona898
  • Created on: 14-06-17 16:42
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  • The Heart
    • Double Circulatory System
      • Right ventricle
        • Pumps deoxygenated blood.
          • To lungs then returns to heart.
      • Left Ventricle
        • Pumps oxygenated blood.
          • to all other organs.
          • Gives up oxygen at body cells.
          • Deoxygenated blood
    • A pumping organ that keeps blood flowing.
    • Walls made of muscle tissue
    • Valves
      • Make sure the blood flows in right direction.
      • Stop blood flowing backwards.
    • How blood is pumped.
      • Flows into two atria from vena cava + pulmonary vein.
      • Atria contract  pushing blood into ventricles.
      • Ventricles contract forcing blood to pulmonary artery
      • Blood flows out of heart
      • Flows to organs through arteries.
      • Returns through veins. Atria fills up and cycle starts over.
    • Needs own supply of oxygenated blood.
      • Coronary arteries
        • Branch off the aorta.
        • Surround hear to make sure it gets the oxygenated blood.
    • Has a pacemaker.
      • Resting heart rate
        • Controlled by group of cells in right atrium wall act like a pacemaker.
          • Produce small electric impulse spreads to surrounding muscle cells causes them to contract.


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