BIOL-242 Chapter Notes - Chapter 21: Adaptive Immune System, Mucin, Defensin
18 May 2020
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Chapter 21. 1 | surface barriers act as the first line of. Defense to keep invaders out of the body. Innate (nonspecific) defense system // prevent the entry and spread of microorganisms into the body, reducing the workload of the adaptive system. The first line of defense is the intact skin and mucosae. The second line of defense is called into action when the first line has been penetrated, and relies on internal defenses such as antimicrobial proteins, phagocytes, and other cells to inhibit pathogenic spread in the body. Trait of second line of defense; inflammation. Innate defense alone often ward off infection, however in some cases the adaptive immune system is called to reinforce and enhance the innate defense. The body"s first line of defense is the skin and the mucous membranes + the secretions the membranes produce. Highly effective combination in protecting body from unwanted pathogens. As long as the epidermis is unbroken, the heavily keratin infused.
