LIFESCI 2 Lecture Notes - Lecture 15: Lymph Node, Immunoglobulin D, Humoral Immunity
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I: antigens = anything that can illicit an immune response a. i. They"re protein markers (often glycoproteins) on surface of cells that say this is me : self antigens b. i. On surface of cell & are recognized by body b. ii. Body doesn"t try to expel these: non-self antigens c. i. Function of immune system: find cells that have non-self antigens on their surface & expel these c. ii. Example of how this can go wrong: autoimmune disease c. ii. 1. Body doesn"t recognize self as self and tries to attack these cells as if they"re foreign c. ii. 2. Pathogens: foreign aka non-self things that get inside the body b. Viruses (have dna & get the cell system to replicate them) b. iii. Ex. tapeworms: want the immune system to recognize and expel these. Overall functions of immune system: get rid of cells with non-self antigens a. i. Ex. get rid of pathogens: get rid of cells that are dead or damaged b. i.
