Link to Specific Defense Mechanisms Diagram  

Pathogen

          Antigen

*Nonspecific defense mechanisms

          Macrophages

          Neutrophils

                    Phagocytize - Phagocytic cell

          Skin, Stomach acid, and Mucus and Cilia in Respiratory Tract

          Inflammation

                    Histamine

          Fever

Allergy

*Specific defense mechanisms

Lymphocytes

          Monocytes become Macrophages

                    "Antigen presenting cell"

                              Major histocompatibility complex - MHC

**Cell-mediated immunity

          T lymphocytes - T cells

                    Cytotoxic T cell

                    Helper T cell

                    Memory T cells

**Antibody-mediated immunity

          B lymphocytes - B cells

                    Plasma B cells

                              Antibodies

                    Memory B cells

Primary response

Secondary response

Active immunity

          Immunizations

Passive immunity

Acquired Immune Deficiency Syndrome - AIDS

          HIV-1 virus