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  • Created by: Chris
  • Created on: 31-12-12 11:10


  • The invading pathogen releases chemicals which act as attractants for a white blood cell causing it to move towards the pathogen 
  • The white blood cell then attaches to the surface of the pathogen and engulfs it to form a vessicle
  • Lysosomes then move towards the vessicle and fuse with it 
  • Enzymes within the lysosomes break down the pathogen and destroy it 
  • Waste products from the pathogen are absorbed into the cytoplasm

Cell mediated immunity:

T lymphocytes respond to an organisms own cells that have been invaded by non self material for example a virus or cancer cell. 

  • Pathogens invade body cells or are taken in by phogocytes
  • The phagocyte places antigens from the pathogen on its cell surface membrane
  • receptors on certain T helper cells fit exactly onto these antigens 
  • This activates other T cells to divide rapidly by mitosis…


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