Cant do the second one of you..
but the first one I can have a go.
Right. Well
When your infected with a pathogen for the first time..
You have ONE B cell that is complementary to the antigen.
More of this B cell is produced via mitosis to form cloned B cells
The B cells produce B plasma cells that make antibodies and these anitbodies destroy the pathogen. This is your Primary Immune Response.
The B cells ALSO produce B memory cells and these are stored.
When you are next infected with the antigen again, a much more RAPID response is produced. The B memory cells develop into B plasma cells and more B memory cells. The B plasma cells produce the antibodies needed to destroy the pathogen. This is your secondary immune response.
Literally just remember.
1st immune response - you have only 1 B cell. This does mitosis so you have tons of clones. Some go to B plasma cells. Some to B memory cells. The B plasma cells make antibodies. The B memory cells are stored. The antibodies get rid of the antigen (because they are cloned they are complementary and antigen-specific)
2nd immune response - Your B memory cells quickly recognise your infected with the same antigen. These develop to B plasma cells and more B memory cells. So you have lots and more antibodies that quickly destroy the anitgen. This is MUCH faster.
Hope that helps. It took me forever to understand this topic, but now it seems easy to me
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