Immune System part 2

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Primary response

Immune system can be spilt into cellular and humoral.

  • Cellular: the Tcells and other immune system cells that they interact with ( phagocytes form the cellular response.
  • Humoral: Bcells and the production of antibodies form the humoral response.


  • When an antigen enters the body for the first time, it activates the immune system. This is called the primary response
  • Its slow as there arent many bcells that make the antibody needed to bind to it
  • Eventually, the body will produce enough of the right antibody to overcome the infection
  • BUT in the mean time you will experience the symptoms of the disease
  • After being exposed to the antigen, Tcells and Bcells produce memory cells.
  • Memory cells will stay in the body for a long time
  • Memory Cells will recognise the specifigic antigen on the second time around.
  • They record the specific antibodies needed to bind to antigen.
  • Now the person is immune. - body can respond more quickly to a 2nd infection.
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Secondary Response


  • If the same pathogen enters the body again, the immune system will produce a quicker andstronger immune response.
  • Memory Bcells divide in to plasma cells to produce the right antibody to the antigen
  • Memory Cells divide in to the correct type of Tcell to kill the cell that carries the antigen.
  • Secondary response gets rid of the pathogen before you being to show any symptoms
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