What is the third line of defense in the immune system?
the third line of defence work as a Primary Responce and a
Secondary Responce the Primary Responce occurs when first a
pathagen enter the body and secondly lymphocytes (b-cell) produce
antibodies and finally antibodies have a speific shape which bind
to antigens on surface of pathagen and then the dead pathagen is
digested is eaten by phagocytes The Second Responce is the
vaccination that contain live pathagen treated to make them
harmless and it contain harmless fragment of the pathagen and dead
phagen or toxins produced by pathagen and while vaccine is given we
will gel active immunity because that vaccine will produce
antibodies for ever