Ch 17 Immunity Sys.docx

Ch 17 Immunity Sys.docx - Immunity System What is the...

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Immunity System What is the Immunity System? The environment is full of pathogens (disease-causing agent), yet we do not constantly get sick This is due to your immunity system Basically the immunity system is a body’s system of protection against infectious diseases Immunity system is divided into two subdivisions 1. Innate immunity – nonspecific response towards a particular kind of pathogen 2. Adaptive immunity – specific response to pathogens Your first line of defense involves the innate immunity This part of the immunity system is fully functional and immediately available without prior exposure to pathogens Innate immunity involves several defenses 1. Barriers to entry Barriers to entry include mechanical barriers and antimicrobial barriers Mechanical barriers Hair in nose traps pathogens Mucus traps pathogens Stomach acid kills pathogens ingested with food or drink Skin prevents penetration by pathogens Antimicrobial barriers Oil glands in skin secrete chemicals that kill certain pathogens Sweat, saliva, and tears contain lysozyme that can kill pathogens 2. Complement proteins Complement proteins are blood plasma proteins that “complement” certain immune responses and help destroy pathogens These proteins are inactive and continually present in the blood When a pathogen is encountered, the complement proteins will be activated 3. White blood cells White blood cells are phagocytic cells that can move out of the blood stream into the infected tissue Neutrophils are the most abundant WBCs and are found in the blood Macrophages are found everywhere and they wander around looking for any pathogens Eosinophils are used to attack animal parasites such as tapeworms 4. Inflammatory response
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  • Fall '19
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