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.human transportū (blood (White blood cells (two main white cells…

- - - - Biconcave shape without nucleus or organelles at maturity, increasing the surface area to volume ratio for faster diffusion of oxygen
      - An iron containing protein which is able to bind reversibly with oxygen
      - Flexibility to turn bell-shaped in order to pass through the narrow lumen of the capillaries
  - - - lymphocytes
      - Phagocytes
  - - - 90% of water
      - few substance like
        
        Fibrinogen
        
        play important part in clotting blood
        
        Prothrombin
        
        play important part in clotting blood
        
        Antibodies
        
        help to fight diseases
    - - food substance
      - hormones
      - dissolved material salts
      - excretory products
  - - - Produce enzymes
  - - - blood clotting
      - phagocytes
        
        process of engulfing
      - production of antibodies
        
        produced by lymphocytes
        
        organ transplant and tissue rejection
- - - - link arteries to veins
      - blood changes from oxygenated at the arteriole end to oxygenated at the venue end
    - - no pulse
      - blood flows slowly
      - blood reduced as blood flows from arteriole to venule end
    - - have a large lumen relative to diameter
      - semi lunar valves abesent
      - one celled thick walls with no muscular or elastic tissues
  - - - have small lumen relative to diameter
      - semi lunar valves absent
      - have thick muscular walls with much elastic tissues
    - - carry blood away from the heart
      - carry oxygenated blood ( except for pulmonary arteries which carry deoxygenated blood)
    - - blood moves in pulses, reflecting the rhythmic pumping action of the heart
      - blood flows rapidly
      - blood under high pressure
  - - - have a large lumen relative to diameter
      - semi lunar valves present
      - have thin muscular walls and little elastic tissue
    - - carry blood towards then heart
      - carry deoxygenated blood (except for pulmonary veins which carry oxygenated blood)
    - - no pulse
      - blood flows slowly
      - blood under low pressure
- - - - two atria
      - two ventricles