THE BLOOD

THE BLOOD

1. Immune response

   • Antigens are sites on the surface of cells allowing it to be recognised by WBC's
   • WBC's release antibodies
     • antibodies work like enzymes ( Lock & Key)
     • Causes problems with donor organs as WBC's may attack and slowly destroy it

2. Composition of Blood

   • Plasma
     • Transports materials around the body
   • Platelets
     • Clot blood
     • Clotting Process
       • Blood is exposed to air
         • Platelets breakdown & fibrin is formed
           • The fibrin forms a mesh which hardens forming a clot
   • White blood cells
     • Used during Phagocytosis
     • Process of Phagocytosis
       • The WBC approaches the bacterium
         • it then engulfes thr bacterium
           • The DNA codes for digestive enzymes
             • The enzymes are released and destroy the bacterium
   • Red blood cells
     • carry oxygen
     • biconcave cells containing no nucleus
     • Contain haemoglobin