[BIOC39H3] - Final Exam Guide - Everything you need to know! (50 pages long)
29 Mar 2017
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Document Summary
To provide immunity that will give future protection from the disease, the immune system must first do battle with the microorganism. The main purpose of the immune system is to protect the human body from infectious disease. Enhance human nutrition by processing digested food and making several vitamins. Pathogens can be divided up into bacteria, virus, fungi, and parasites. For some pathogens, controlling infections necessitates their complete elimination, but for others it is sufficient to limit the size and location of the pathogen. Organisms with the potential to cause severe and rapidly fatal disease often evolve toward an accommodation with their hosts. Human populations evolve a degree of built-in genetic resistance to common disease-causing organisms, as well as acquiring lifetime immunity to endemic diseases (measles, chickenpox, etc. ) The skin is the human body"s first defense against infection: it forms a tough, impenetrable barrier of epithelium protected by layers of keratinized cells.
