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1.Immunology:Is the science that study of our protection fromforeign macromolecules or invading organismspresent in the environment and our responses tothem.2. Immune System:Group of molecules, cells, tissues and organswhich provide non-specific and specific protectionagainst Microorganisms, Microbial toxins, Tumorcells.Definitions:3. Immune response:The collective and coordinated reactionbetween the immune cells and moleculesto get rid of microbes.4. Immunity :Defense capacity of the body to combatdiseases (reaction to foreign substances).Immunology lingoHoste.g. meAntigenEverything that should not be in my body, Foreign or toxic tothe body (macromolecule) e.g. virus protein, worm, parasite.Antibody (Immunoglobulin (Ig) )Is a large Y-shape protein produced by plasma cells that isused by the immune system to identify and neutralize foreignobjects such as bacteria and viruses.PathogenMicroorganism that can cause disease (anything that canproduce disease).Role of the immune system1. Defense against microbes2. Defense against the growth of tumorcells (kills the growth of tumor cells)3. HomeostasisDestruction of abnormal or dead cells