MICR 270 Chapter 2: MICR 270 – Module 2 (A)
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10 Mar 2017
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Describe the key differences of both the innate and adaptive immune systems. Oldest host defense system (present in all multicellular organisms) Operates non specifically during the early phases of an immune response (without the need for prior exposure to the invading pathogen) First line of defense against infection and includes both external and internal nonspecific responses. Occur in areas of the body exposed to. Occur in areas of the body that are the outside environment. Unbroken skin and mucous membranes of the respiratory, alimentary, and urogenital tracts are important mechanical barriers to invasion by microorganisms not exposed to the outside environment. Includes many phagocytic cells and other cell types, as well as the complement system and cytokines. Phagocytic cells (phagocytes) that patrol the body searching for pathogens to engulf. Most common leukocytes found in the blood of most mammals (comprising approx. Short lived, and do not reside in the tissue before infection.
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