The Circulatory System B2.3

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  • Created by: Revise15
  • Created on: 19-05-16 21:12
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  • The circulatory System
    • Blood vessels are tube shaped organs that carry blood
    • artery- carries blood away from the heart
      • High pressure so that the blood can reach all parts of the body
        • thick strong walls enforce this pressure
    • Capillaries allow substances to diffuse into and out of blood, into the cells in  tissues
      • They have very thin wall s ( one cell thick)  to make diffusion more effective and efficient
        • very low blood pressure
      • found in muscles and lungs
    • Veins are blood vessels that have wide passages inside them because the blood flows relatively slowly under low pressure from an organ to the heart
      • have valves to prevent blood flowing backwards

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