BIOL 1030 Chapter Notes - Chapter 43: B-Cell Receptor, Cytotoxic T Cell, Antigen-Presenting Cell

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1030
• Professor: Scott Kevin

Document Summary

Overview: reconnaissance, recognition, and response: an animal must defend itself against unwelcome intruders the many potentially dangerous viruses, bacteria, and other pathogens it encounters in the air, in food, and in water. It must also deal with abnormal body cells, which, in some cases, may develop into cancer: two major kinds of defense have evolved to counter these threats, the first kind of defense is innate immunity. Innate defenses are largely nonspecific, responding to a broad range of microbes. In the humoral response, cells derived from b- lymphocytes secrete defensive proteins called antibodies that bind to microbes and target them for elimination. In the cell-mediated response, cytotoxic lymphocytes directly destroy infected body cells, cancer cells, or foreign tissue. Concept 43. 1 innate immunity provides broad defenses against infection: an invading microbe must penetrate the external barrier formed by the skin and mucous membranes, which cover the surface and line the openings of an animal"s body.