AQA As Biology 5.1 The structure of the heart

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  • Created by: maddie
  • Created on: 24-11-12 16:18
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  • The structure of the heart
    • Two pumps each with two chambers
      • atrium
        • Thin-walled, elastic, stretches when filled with blood
        • Thin muscular wall - only pumps blood to ventricle - short distance.
      • Ventricle
        • Thich muscular wall - pump blood to lungs or body - larger distance
        • Left and right vernticle. Left - thick musclular wall = produce enough pressure to punmp blood to body. Right = thin, pump blood to luings needs little pressure
      • Left pump - oxgenated blood from lungs, right deoxgenated blood from body
      • Why two pumps?
        • Blood has to pass through thin capillaries in lungs to give large surface area for gas exchange so pressure drops.
          • Low pressure= flow to body slow so blood returnerd to heart to increase pressure
      • Valves between atrium and ventricle to prevent backflow
        • left atrioventricular (biscupid) valves - formed of 2 cup-shaped flaps of left side of heatrt
        • right atrioventricular (triscupid) valve: 3 cup-shaped flaps on right side
    • chambers served by blood vessel.Ventricle: blood away, arteries: blood towards. Atria recieve blood from veins
    • vessels connecting heart - lungs: Pulmonary vessels. Vessels connected to chambers:
      • Vena Cava


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