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IBDP Biology: Immunity

Immunity

· Biology,Immunity,immune System,IBDP BIOLOGY,ib biology

In this topic of IBDP Biology, we will learn about the function of body defence mechanisms.

Defence Mechanisms

  • Non-Specific - response is immediate and the same for all pathogens
  • Physicial Barrier (e.g. skin)
  • Phagocytosis
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  • Specific - response is slower and specific to each pathogen
  • Cell medidated response (T cells)
  • Humoral response (B cells)

Antigens

  • When it comes to IBDP Biology, any part of an organism or substance which is foreign (non self), and stimulates an immune response. 
  • They are usually proteins which usually are on the cell surface membranes of pathogens.
  • Antigens are not always on the invading cell. You can have antigen-presenting cells which are cells from the immune system which take the pathogen's antigens and allow the functions of the immune system to work. 
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Lymphocytes

When it comes to IBDP Biology, lymphocytes are white blood cells. There are two types of lymphocytes:

  • T lymphocytes (T cells)

- mature in the thymus gland

- associated with cell mediated immunity

  • B lymphocytes (B cells)

- mature in the bone marrow 

- associated with humoral immunity 

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Cell Mediated Immunity/Humoral Immunity

In IBDP Biology,

  • Cell mediated immunity- immunity with body cells involving T cells
  • Humoral immunity- immunity with bodily fluids involving B cells

This is the end of this topic

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