Zoology - Human Health and Diseases Question with Solution | TestHub

Antibody mediated immune system or humoral immunity consists of antibodies (specialised proteins produced in the body in response to antigen) that circulate in the body fluids like blood plasma and lymph. B-lymphocytes (B-cells) produce antibodies that regulate humoral immunity. T-lymphocytes themselves do not secrete antibodies but help B-lymphocytes produce them. Humoral immunity provides defence against most extracellular bacterial pathogens and viruses that infect through respiratory and intestinal tract.