Here's why:

* Humoral immunity refers to the immune response mediated by antibodies produced by B cells.

* B cells are a type of white blood cell that mature in the bone marrow. They are responsible for producing antibodies, which are proteins that specifically target and neutralize pathogens.

* B cell mechanisms include processes like:

* Antibody production: B cells differentiate into plasma cells, which are specialized antibody-producing cells.

* Antigen presentation: B cells can present antigens to T cells, helping to activate the adaptive immune response.

* Memory cell formation: B cells generate memory cells that remember previous encounters with pathogens and can mount a faster and more effective response upon re-exposure.

In contrast to the humoral immune response, the cell-mediated immune response is driven by T cells, which directly attack infected cells and tumors.