IMMUNOLOGY

Detailed explanation-1: -5 types of antibodies, each with a different function There are 5 types of heavy chain constant regions in antibodies (immunoglobulin) and according to these types, they are classified into IgG, IgM, IgA, IgD, and IgE.

Detailed explanation-2: -Types of immunity: Active natural: Body produces antibodies in response to exposure to a live pathogen. Active artificial: Body produces antibodies in response to a vaccine. Passive natural: Antibodies are passed from the mom to her baby through the placenta and breastmilk.

Detailed explanation-3: -The main components of the immune system are the thymus, spleen, Lymph Nodes, bone marrow and white blood cells. A brain is not involved in elicitation of immune response but regulates the function of the whole body. Hence option A is correct.

Detailed explanation-4: -The body has five different types of antibodies, also known as immunoglobulins. IgA, IgD, IgG, IgE, and IgM are different immunoglobulin isotypes. Immunoglobin A (IgA) is found in mucosal tissue and is the front line defense against infection. IgA binds to pathogens to tag them for destruction from other antibodies.

Detailed explanation-5: -Antibodies are the component which doesn’t participate in innate immunity.