Final answer:
Humoral immunity is mediated by B cells that produce antibodies to target extracellular pathogens, while cellular immunity involves T cells that directly attack intracellular pathogens.
Step-by-step explanation:
Humoral and cellular immunity are two components of the adaptive immune system. Humoral immunity is mediated by B cells which produce antibodies that target pathogens in extracellular spaces. Cellular immunity, on the other hand, involves T cells that directly attack and eliminate intracellular pathogens. B cells mature in the bone marrow, while T cells mature in the thymus.