IMMUNOLOGY

Detailed explanation-1: -B-cells produce antibodies to fight bacteria and viruses. These antibodies are Y-shaped proteins that are specific to each pathogen and are able to lock onto the surface of an invading cell and mark it for destruction by other immune cells.

Detailed explanation-2: -Antibodies, also known as immunoglobulins, are glycosylated protein molecules present on the surface of B cells (surface immunoglobulins) serving as antigen receptors (BCR), or are secreted into the extracellular space where they can bind and neutralize their target antigens (15).

Detailed explanation-3: -Plasma cells are differentiated B-lymphocyte white blood cells capable of secreting immunoglobulin or antibodies. These cells play a significant role in the adaptive immune response, namely, being the main cells responsible for humoral immunity.

Detailed explanation-4: -B lymphocytes become cells that produce antibodies. Antibodies attach to a specific antigen and make it easier for the immune cells to destroy the antigen. T lymphocytes attack antigens directly and help control the immune response.