Mode of action of B-cells. 1. When antigens invade a tissue fluid, B-cells are stimulated to produce antibodies.

2. The body has thousands of antigen-specific B-cells.

3. The membrane of each type would have been sensitized by previous contact with the antigen.

4. If this does not happen, the B-cell dies quickly. However, there is a constant supply of new B-cells. Once an antigen-specific B-cell is triggered by the antigen, it gives rise to a clone of plasma cells by quick multiplication.

5. Most members of this clone produce antibody at the rate of about 2000 molecules per second.

A summary of action of B-cell (Humoral Immunity)