BIO120H1 Chapter Notes - Chapter 1: Dendritic Cell, Eosin, Histology

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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Immunology-study of the physiological mechanisms that humans and other animals use to defend their bodies from invasion by other organisms. Infectious disease are caused by microorganisms, which have the advantage of reproducing and evolving much more rapidly than their human hosts. In response, the human body invests heavily in cells dedicated to defense=immune system. All humans suffer from infectious diseases because the immune system takes time to build up its strongest response to an invading microorganism, time during which the invader can multiply and cause disease. More than 500 microbial species live in a health adult human gut and contribute about 2 pounds to the bodys weigh, called commensal species (eat at the same table) The community of microbial species that inhabits a particular niche in the human body-skin, mouth, gut, vagina called flora ex: the gut flora. Cant be studied properly because they require special conditions. Commensal organisms enhance human nutrition by processing digested food and making vitamins.

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