IMMUNE SYSTEM

Nonspecific Mechanisms Physical barriers – skin, mucus, etc. Macrophages – engulf foreign cells and particles Natural killer cells – wa-ka Histamine – causes inflammation

Specific Mechanisms Cell-mediated immunity – T cells provide defenses Humoral immunity – B cells produce antibodies to provide defenses

T cells Killer T cells – Kill virus-infected or foreign cells Helper T cells – Signals others to attack Memory T cells – Store info on antigen structure Suppressor T cells – inhibit helper T cells to prevent uncontrollable destruction

B cells Plasma cells – produce antibodies Memory B cells – store information on antigen structure

Types of Immunity Naturally acquired – made by body Artificially acquired – injected Active immunity – from your body Passive immunity – from someone else

Types of Immunity Naturally acquired active immunity Naturally acquired passive immunity Artificially acquired active immunity Artificially acquired passive immunity

Diseases Immunodeficiency Autoimmune AIDS SCID Diabetes Multiple Sclerosis (MS)