Inflammations are a primary response that happense when a foreign substance enters the skin. It itself does not destroy the pathogen, but induces phagocytes to go to to the area and destroy all the foreign bodies at the point of entering.
1) Mast cells release histamines. these cause the area to swell, burn up, or become inflammed. The point of this is to increase blood to be routed to the area.
2) the histamines do a few things after this. This is dependent on what receptors binds to the histamine. In order of the receptors Hn:
H1 - the body becoming more alert and awake and inflammation or hives
H2- muscles relaxing, release of gastric acid
H3 - mast cells stop producing histamines
H4 - opens up capillaries, making them leak, allowing white blood cells to be released
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