Blood Vessels

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  • Created by: Jasmin
  • Created on: 06-05-13 11:52
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  • Blood Vessels
    • ARTERIES
      • Carry blood away from the heart to the organs
      • Carry blood under pressure
      • Contain thick layers of muscle to make strong walls
      • Elastic fibres allow walls to stretch and spring back
      • Walls are thicker than lumen
      • Blood is usually bright red and oxygenated
    • VEINS
      • Carry blood to the heart
      • Capillaries eventually join up to form veins
      • Blood is at lower pressure in veins so walls do not have to be as thick
      • Bigger lumen to help blood flow despite low pressure
      • Blood is low in oxygen - deep purperly - red colour
      • Do not have a pulse
      • Have valves to prevent the blood flowing in the wrong direction
    • CAPILLARIES
      • Form a huge network of tiny vessels linking arteries and veins
      • Arteries branch into capillaries
      • Really tiny
      • Involved in exchange of materials at the tissues
      • Really close to every cell
      • Permeable walls so substances like glucose and oxygen can diffuse in and out
      • Supply food and oxygen and take away waste like CO2
      • Walls are only one cell thick. Increases rate of diffusion by decreasing distance over which it occurs

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