immune system

immune system - The Immune System Innate immunity- broad...

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The Immune System Innate immunity - broad defense system which protects body from a wide variety of pathogens  before ever coming in contact with them Innate immunity provides immediate response to infection but in a generic way. Components of innate immunity: o The skin     The skin acts as a wall of cells that prevents many harmful bacteria and  viruses from penetrating into the body. o Mucous Membranes     The mucous membranes in the mouth, digestive tract, respiratory tract  and nasal cavity are thick layers of mucous that contain phagocytic cells  and powerful enzymes that prevent entry of a large variety of bacteria and  viruses. o Secretions      from skin contain chemicals that help destroy pathogenic substances/ bacteria. o Inflammatory response     - This response is initiated by injured cells via secretion of  chemical signals in order for the body to attempt to contain the infection. Complement System     - A group of plasma proteins release during the  inflammatory response that help recruit inflammatory response cells,  break down infected cell walls and tag pathogens for destruction by other  cells. When the  body first 
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recognizes an infection the first response is to increase blood flow to the  infected area, specifically to the capillaries around the area of infection.  This is done by release of Histamine from mast cells around infected area  which cause vasodilation (widening of blood vessels). The body also makes the capillary walls, near the site of infection, more 
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immune system - The Immune System Innate immunity- broad...

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