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12-Immunitynotes (Autosaved)

12-Immunitynotes (Autosaved) - The immune system Infectious...

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The immune system +Infectious attack >body is constantly under attack >must distinguish foreign from native molecules >must communicate/coordinate between elements of immune system >protect three main access routes to body >respiratory tract >digestive tract >skin lesions >all passages are protected multiple ways +Epithelium >all three passages have an epithelial tissue lining >tightly packed cells; impenetrable barrier >produce lysozymes to break bacterial cell walls >secrete mucus to trap invading organisms >secrete molecules that make an acidic environment >sweat glands on skin/ stomach acid >embedded within the epithelium are many important immune cells +Innate and adaptive immunity >successful invasion past epithelial defenses meets two other levels of defense 1. Nonspecific (innate) immune system
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> acts very rapidly against infectious attack >detects broad classes of molecules 2. Specific (adaptive) immune system >slower to respond >Detects specific patterns seen on classes of molecules
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