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Thursday 7 February 2013

Dematitue

Allergic get through dermatitis
Allergic give dermatitis is caused by contact with a sensitiser (allergen) that causes a type IV or slow hypersensitivity reaction. A sensitizer is a mental object that screw induce an over-reaction of the bodys immune system.

A sensitizer must first penetrate the skin (most contact sensitizers ar small molecules with molecular weights below 1000). Some require energizing through skin metabolism before they stick out sensitize. adjoining the sensitizer is combined with skin immune cells (Algerians cells) which then moderate the skin and travel to lymph glands nearby.  Here, they react with another type of immune cell (T-lymphocytes or T-cells), which reproduce and produce memory cells that can remember that particular sensitizer.

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erstwhile sensitization has go pastred, subsequent contact causes T-cells to recognize the sensitizer and multiply. This induces the release of substances such as histamine that set ashore about the features of inflammation. This second phase can happen hours or days following contact hence its name delayed hypersensitivity. Very small quantities of the sensitizer can trigger a response once sensitized.

Some sensitizers are potent, others are not, and umpteen are in between.

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The initiation of sensitization may occur at the very first contact or it may not happen until there has been repeated contact for months or even years. The process of sensitization produces no visible sort in the skin.

Generally, only a small proportion of an heart-to-heart occupational group becomes sensitized. It depends on the concentration of sensitizer and the pointedness and duration of skin contact - as well as the sensitizing potential of the sensitizer.

Sensitization is specific to one substance or to a group of substances that are chemically similar. Once sensitized a person is likely to remain so for life.

Dermatitis (eczema) is inflammation of the upper layers of the skin, causing itching, blisters, redness, swelling, and...If you want to get a full essay, order it on our website: Ordercustompaper.com



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