B2 - The Circulatory System

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  • Created by: Friesia
  • Created on: 26-10-15 10:53
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  • B2 - The circulatory system
    • Oxygen and nutrients are carried in blood to the body cells
    • Waste substances, eg. CO2 are carried away from the cells
    • The heart has a double pump
      • the right side pumps de-oxygenated blood to the lungs to collect oxygen and remove carbon dioxide
      • The left side pumps oxygenated blood around the body
    • There are three major types of blood vessel
      • Arteries
        • carry blood away from the heart to the body cells
        • comes out of the heart at high pressure
          • so the artery walls have to be strong and elastic
            • thicker than veins
      • Veins
        • carry blood back to the heart
        • Blood is at lower pressure so the walls dont have to be as thick
        • Have a bigger lumen to help the blood flow through more easily
        • Have valves to help blood flow in the right direction
      • Capillaries
        • branches of arteries that are really tiny
        • carry the blood really close to each individual cell in the body to exchange substances with them
        • permeable walls so substances can diffuse in and out
        • supply nutrients and oxygen and take away wastes like CO2.
        • walls are only one cell thick
          • increases the rate of diffusion


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