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Natural Immunity

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Question
Answer
Which line of defense provides specificity and long-term immunity?   acquired immunity provides specificity and long-term immunity  
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List seven natural physical barriers to infection   skin, mucus, cilliated epithelial cells,  
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List 5 specific factors of the body's natural immunity that reduce infection and explain how they reduce infection   mucus--traps airborne microbes, fluid flow--flushes out pathogens, GI tract--acid kills microbes, bodily secretions containing lysozyme--degrades bacterial cell walls, iron-binding proteins--prevent adequate nutrition for bacteria  
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Where is lysozyme found and what does it do?   found in all bodily secretions--degrades bacterial cell walls  
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How does complement kill microbes?   complement proteins circulate through body and bind to bacterial-bound antibodies--to bacterial polysaccharides to form membrane attack complex(C6-C7-C8-C-9) produce pores in bacterial membrane--leakage and lysis of microbe  
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What are the functions of C3 and C5a?   chemotactic factors that recruit phagocytic cells to the site of infection  
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What is the function of polymorphonuclear leukocytes (PMNs), or neutrophils?   engulf and digest foreign matter  
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How abundant are PMNs?   comprise 55% of all white blood cells  
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what do PMNs and macrophages both have receptors for?   IgG antibodies and the C3b component of complement  
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List some things that inhibit phagocytes   Low pH environments, poorly oxygenated tissue, and fluid-filled spaces inhibit phagocytes  
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what host response do basophils and mast cells stimulate?   inflammation  
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what agents do eosinophils help fight?   release toxins that fight organisms that are too large for phagocytes to ingest, such as worms  
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Created by: heatherlvn
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