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lecture 4-17 immune sys I

lecture 4-17 immune sys I - Chapter 43 Immune system...

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Chapter 43 – Immune system Learning objectives • Understand the difference between an antigen and an antibody. • Distinguish between innate immunity and acquired immunity • Know the innate, nonspecific, lines of defense in the vertebrate body. • Describe the roles of antimicrobial proteins in innate immunity. • Describe the inflammation response
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Innate immunity Is present before any exposure to pathogens and is effective from the time of birth Involves nonspecific responses to pathogens Acquired immunity (also called adaptive immunity) - Develops only after exposure to inducing agents such as microbes, toxins, or other foreign substances - Involves a very specific response to pathogens The immune system has two major kinds of defense…
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Innate immunity Involves nonspecific responses to pathogens External Internal Cellular and Chemical
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External Defenses Intact skin and mucous membranes Form physical barriers that bar the entry of microorganisms and viruses Certain cells of the mucous membranes produce mucus A viscous fluid that traps microbes and other particles
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