Biology Notes Fa Fsc Chapter No 13 Immunity

Biology Notes Fa Fsc Chapter No 13 Immunity

Biology FA/FSC 1st-year notes short question, long question, exercise, examples, entry test MCQs, previous entry test MCQs for chapter no 13 immunity biology Class 11 Notes.
Biology Notes Fa Fsc Chapter No 13 Immunity
Biology Notes Fa Fsc Chapter No 13 Immunity

Immunity

Definition: “The ability of a body wich resit against the disease or pathogen is known as immunity.”
Immunology:- it is the branch of biology in which we study about immunity.
 
Q; What is first-line defence, explain  its components:
Firstline defence definition:- “These is non-specific and included structures, chemicals, and processes that work to prevent pathogens from entering the body.”
 
Components of first-line defence: (also important for MCQs)
The first line defenders include the skin and mucous membranes of the respiratory, digestive, urinary and reproductive systems.
 
(A) Skin as a first-line defence:
Introduction:- skin is regarded as one of the first lines of defence because it provides a biological barrier, protecting the internal organ.
 
Importance: (Role)
  1.  it protects the body especially the underlying tissues against pathogens.
  2.  it protects the body from excessive water loss.
  3. it is also involved in providing insulation and temperature regulations.

 Biology Notes Fa Fsc Chapter No 13 Immunity PDF Notes

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