The upcoming discussion will update you about the difference between active immunity and passive immunity. Difference # Active Immunity: 1. Host participation: Produced actively by the immune system of host. 2. Activation: Induced by infection or by contact with immunogen. 3. Duration of effectivity: Immune response-durable and effective. 4. Time: Immunity effective only after lag period. 5. Memory: Immunological memory [...]
In this article we will discuss about the primary and secondary lymphoid organs. Primary Lymphoid Organs: In primary lymphoid organs, immature lymphocytes differentiate to mature ones into an antigen sensitive lymphocytes and after maturation, lymphocytes migrate to secondary lymphoid organs. These are of two types: (a) Bone marrow (b) Thymus (a) Bone Marrow: It is the main lymphoid organ, where [...]
In this article we will discuss about the structure of an antibody molecule with the help of a suitable diagram. Also learn about its types. Antibody is a type of protein molecule produced by B-lymphocytes in response to pathogens. T-cells do not secrete antibodies directly however, they help B-cells to produce them. Each antibody molecule has four peptide chains. Out [...]