Here's how it works:

1. Germ Entry: When germs (like bacteria or viruses) enter the body, they are recognized as foreign invaders by the immune system.

2. Antigen Presentation: Specialized cells called antigen-presenting cells (APCs), like macrophages, engulf the germs and present fragments of the germ (antigens) to B cells.

3. B Cell Activation: The B cells with receptors that match the presented antigen become activated.

4. Plasma Cell Differentiation: Activated B cells differentiate into plasma cells.

5. Antibody Production: Plasma cells are antibody factories, producing and releasing large amounts of antibodies specific to the invading germ.

6. Neutralization: Antibodies bind to the germs, neutralizing them and preventing them from causing further harm.

So, B cells are the key players in antibody production, and they play a vital role in fighting off infections.