BIOL 202 Chapter Notes - Chapter 20: Fibrin, Microorganism, Vacuole

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Chapter 20: resistance and the immune system; innate. The immune system is a network of cells and molecules to defend against. Lymphatic system is composed of cells and tissues essential to immune. Innate and adaptive immunity compose a fully functional human immune. Surface barriers are part of innate immunity: host defensive barriers limit pathogen entry, many portals of entry in the body that can be advantageous for pathogens; intact skin, mucus membranes, body cavities. Cellular barriers: innate defensive barriers that include the normal microbiota of body surfaces, these microbiota outcompete foreign pathogens for resources, killing their chances for survival. Innate immunity depends on receptor recognition of common pathogen- 5: tl s are lo(cid:272)ated o(cid:374) the (cid:272)ell(cid:859)s plas(cid:373)a (cid:373)e(cid:373)(cid:271)ra(cid:374)e and membrane compartments called endosomes, when tlrs bind to a pamp, defensive processes are activated (phagocytosis, inflammation) and antimicrobial agents are released. Nets form as a physical barrier that blocks the spread of a pathogen.

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