PSY333H5 Chapter Notes - Chapter 8: T Helper Cell, Innate Immune System, Inflammatory Bowel Disease
Document Summary
Immune system basics immune system defends the body against infectious agents (ex. Viruses, bacteria, fungi, and parasites) immune defences brought by lymphocytes/monocytes (known as white blood cells collectively) two types of lymphocytes: t cells originate in bone marrow, migrate to thymus. Several kinds of t cells (t helper, t suppressor cells, cytotoxic killers, etc. : b cells - originate in bone marrow, mature in bone marrow. T/b cells attack infectious agents: t cells: cell-mediated immunity (page 141) When infectious agent invades the body, recognized by a macrophage (type of monocyte), and presents the foreign particle to a t helper cell. T cells begin to proliferate in response to the invasion. Results in activation and proliferation of cytotoxic killer cells which attack and destroy the infectious agent. T-cell component of the immune system is knocked out by aids virus: b cells: anti-body mediated immunity (page 142) Once macrophage t-helper cell collaboration occurred, t helper cells stimulate.
