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TRANSPORT IN HUMANS, A MESS also idk their emails so um yes - Coggle…

- - - - -No nucleus to provide more space to carry more haemoglobin, more oxygen trans
      - Biconcave shape to increase sa to vol ratio, faster diff of oxy, faster transport
      - Flexibility to turn bell-curved to squeeze through narrow lumen of caps
    - - Transports oxygen
  - - - Plays a role in blood clotting by producing enzyme
        
        damaged tissues and cells -> thrombokinase
        thrombokinase and ca ions makes prothrombin -> thrombin
        thrombin makes fibrinogen -> insoluble fibrin threads that form a mesh to trap blood cells
  - - - Produces antibodies which cause foreign bodies, causing them to agglutinate so that phagocytosis can occur, antibodies destroy bacteria by attaching itself and also neutralises toxns
    - - Phagocytes are needed for phagocytosis to occur in which phagocytes ingest and engulf then digest foreign bodies to destroy them
- - - - Carries blood rich in oxygen away from heart to rest of body (except pulmonary artery - deoxygenated)
    - - Thick elastic muscular walls to withstand the high blood pressure of blood forced out of heart
        Small lumen
        Elasticity of arteries help it stretch and recoil to push blood in spurts and give rise to pulse
  - - - Allow exchange of gases, nutrients, waste materials btwn blood and cells
    - - Endothelium is partially permeable to allow certain substances to diffuse quickly
        Branch repeatedly to provide a large surface area for exchange of subs btwn blood and tissue cells
        One cell thick so faster diffusion
  - - - Thinner elastic walls as blood carried is of low pressure
        Contains valve which help prevent backflow of blood
    - - Carries blood low in oxygen from rest of body to heart (except pulmonary vein - oxygenated)