Memory cells are genetically programmed cells that have gone through an initial exposure to a pathogen/antigen that can coordinate a much more specific and rapid response if we are ever exposed to that same pathogen/antigen.
Specific protein markers that are created by the immune system for binding and reacting to specific antigens; antibodies are created by B cells during humoral immunity.
Also known as B lymphocytes, B cell carry out a version of specific immunity called humoral immunity. During humoral immunity B cells form into plasma cells that mass produce antibodies to be secreted into our body tissue cavities.
Also known as T lymphocytes, T cells carry out a version of specific immunity called cell-mediated immunity or cellular immunity. During cellular immunity the immune response is enhanced by helper T cells and cells are directly attacked by cyotoxic T cells.
Also known as specific immunity, adaptive immunity is carried out by T & B lymphocytes and reacts to specific antigens of cells; adaptive immunity also produces memory cells to target the same pathogen if we are ever exposed to it again.
A particle that has the potential to stimulate an immune response; antigens are basically the identity marker of cells for the immune system to see.