The heart, overview

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  • Created by: ashleigh
  • Created on: 28-04-13 13:59
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  • The Heart
    • Cardiac cycle
      • Ventricle relaxes, atria contracts
        • Ventricle contracts, artria relaxes
          • Ventricles relax, atria relaxes
    • Pulmonary ventilation = breath rate x tidal volume
    • The Av valves link to the atria & stop blood flowing backwards into the atria when the ventricles contract
      • The Semi-lunar valves link to the pulmonary artery and aorta and stop blood flowing back into the heart after the ventricles contract
        • If there's a higher pressure behind a valve, it's forced open, but if the pressure is higher in front of the valve it's forced shut.
  • Left ventricle has a thicker muscle wall and a greater contraction force
    • This is because it needs to pump blood all the way around the body
      • Whereas the right ventricle only needs to get blood to the lungs.
        • The Heart
          • Cardiac cycle
            • Ventricle relaxes, atria contracts
              • Ventricle contracts, artria relaxes
                • Ventricles relax, atria relaxes
          • Pulmonary ventilation = breath rate x tidal volume
          • The Av valves link to the atria & stop blood flowing backwards into the atria when the ventricles contract
            • The Semi-lunar valves link to the pulmonary artery and aorta and stop blood flowing back into the heart after the ventricles contract
              • If there's a higher pressure behind a valve, it's forced open, but if the pressure is higher in front of the valve it's forced shut.
  • Heart rate= number of heartbeats per minute (surges of blood forced through the arteries when the heart contracts)
    • Stroke volume= volume of blood pumped during each heartbeat, measured in cm3
  • Heart muscle is myogenic so it contracts and relaxes without receiving signals from nerves.

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