BIOL 4105 : BIOL4105 Notes Exams 1&2
Document Summary
Symbiosis: two organisms living in close association for a long period of time. In the case of parasites, the parasite benefits and the host is harmed. Innate: does not require prior exposure to a specific substance. Aquired: requires prior exposure to a specific substance. Have to come in contact with the substance and develop the defense against it. 3 lines of defense: first line: physical barriers to the ability of parasite to invade host, second line: nonspecific defenses of host; innate defenses, third line: specific and acquired; prior exposure required skin mucous membranes. Immunity comes from the greek word for exempt . Blood is a specialized connective tissue in your body composed of two parts: fluid part: contains dissolved substances such as proteins, hormones, Plasma is blood w/ particulates and serum is w/o particulates nutrients, gases, etc: particulate part: cells (rbc"s, wbc"s) and platelets. Neutrophils (pmn"s) majority of wbc"s, about 65% First on the scene, non-dividing, short-lived (about 24 hours)
