most B lymphocytes require stimulation from t-helper cells, activated t-helper cells release lymphokines (type of cytokine) which is a chemical specific B lymphocyte that was formed against that specific antigen.
when activated, b cells enlarge, divide and differentiate into a clone of plasma cells. With each division, one newly formed cell will become a plasma cell and the other will become a memory cell.
the plasma cells become active at this time and scretes about 2000 antibodies per second/per cell, for up to about 4-5 days, until the plasma cell dies.
antibodies that are produced then react to antigens by attaching to them directly which completely disables them from multiplying, producing toxins, or doing any further damage to the body.