HLSC 1201U Lecture Notes - Lecture 7: Immunoglobulin G, Immunological Synapse, Peptide
Document Summary
The immune system protects against assaults on the body. External assaults e. g. microorganisms bacterial, viral, parasitic, ringal. Self antigens - molecules on the surface of cells that are unique to an individual: self identity do not attack (= self-tolerance) Nonself antigens - molecules on the surface of foreign or abnormal cells = Innate immunity- born with it, no memory, no specificity, response is always the same. 1st line of defense characteristics of an organism or species defend against pathogens. Internal environment of the body is protected by a barrier formed by the skin and the mucous membranes- digestive tract, respiratory, urogenital. Skin and mucous membranes provide additional immune mechanisms sebum, mucus, enzymes, and hydrochloric acid in the stomach. Other cells release cytokinins (cell movement), prostaglandins. Act to dilate blood vessels + increase vascular permeability- more water can leak out of blood vessels.
