non specific response

• describe how a phagocyte might destroy a bacteria

  • phagocyte attracted to bacteria by chemicals
  • engulf bacteria
  • bacteria in vacuole / vesicle
  • lysosome fuses and empties enzymes into vacuole
  • bacteria hydrolysed by lysozymes
• describe how phagocytes destroy bacteria

  phagocytes attracted to dying cells / chemicals released by cells

  phagocyte engulfs the bacteria

  bacteria in vacuole - lysosome fuses with / empties enzymes into vacuole

  lysosome fuses with bacteria and releases lysozymes to break down bacteria
• What are the similarities and differences between T-lymphocyte and B lymphocytes?

  T lymphocytes target body cells and include cell mediated immunity found in the thymus gland

  B-lymphocyte target humoural immunity another child in the bone marrow

  b cells produce antibodies

  both have receptors
• Describe how T lymphocytes respond to the presence of a pathogen

  Divide by clonal selection

  become memory cells

  stimulate the cells