Zoology - Human Health and Diseases Question with Solution | TestHub

Primary lymphoid organ includes Bone marrow and Thymus. Secondary lymphoid organ include spleen, lymph nodes, MALT, vermiform appendix, etc. The antibodies which are associated with mucosa layer is IgA antibody. Vaccination is an example of Artificial Active Immunity due to production of memory cell. Spleen is called Graveyard as well as reservoirs of RBCs (Blood bank)