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Circulatory System - Coggle Diagram

- - - - transport blood away from the heart
      - Thick muscular wall and narrow lumen
    - - Connect veins with arteries
      - one cell thick
        
        Exchange of substances
    - - Transport blood back to body
      - Thin wall and thick lumen. Has valves.
  - - - Transports nutrients (minerals, glucose, hormones, proteins
    - - Defense against diseases (immunity)
        
        Phagocytes
        
        engulf bacteria/virus
        
        Lyphocytes
        
        make antibodies
    - - Transport oxygen using haemoglobin
    - - Blood clotting
  - - - The walls have to be made out of muscle to pump