BIOL 1202 Study Guide - Natural Killer Cell, Innate Immune System, Cell-Mediated Immunity
Document Summary
Chapter 43: distinguish between, innate immunity (all animals) A defense that is active immediately upon infection and is the same whether or not the pathogen has been encountered previously. Provide barriers to infection such as skin or shell, secretions, natural killer cells. Name four types of phagocytic leukocytes: phagocytosis. Hemocytes (immune cells) carry out defense, the cellular ingestion and digestion of bacteria and other foreign substances: four types of phagocytic leukocytes. Toll- like receptor (tlr: binds to fragments of molecules characteristic of a set of pathogens and tlr proteins trigger internal innate immune defenses, engulfs them trapping them in a vacuole and destroyed by lysosomes. Neutrophils: circulate in the blood, are attracted by signals from infected tissues and then engulfs and destroys pathogens. Larger, some move through body and some stay in same organs where they are likely to encounter pathogens. Dendritic cells: populate tissue, such as skin, contact the environment, stimulate adaptive immunity against pathogens they encounter and engulf.
