Question

4) Explain why a first-time exposure to an allergen may produce only a mild reaction?

Answer 1

Ans:-

Concept:- there are two type of immune responses in our body 1 is primary immune response and other is secondary immune response.

when a foreign unknown antigen is exposed to our body for the first time then it is called primary immune response during this response antigen is first processed by the antigen presenting cell and then this processed antigen is present 2 you t cell throw MHC molecules this season activate b cell to form memory B cell and plasma cell which form antibody against this foreign antigen as it is clear that this is quite a long process so primary immune response is mild reaction.

but when the same antigen is again exposed to our body cells then secondary immune response which is very e fast and effective this secondary immune response orcas due to the presence of of memory B cell which was formed the past due to primary immune response so it take less time and is more effective.