In the fight against disease medication plays a very important role. However human bodies have many natural defences against disease the most important being the prevention of pathogens entering the body the skin, mucous membranes and stomach acid play a very important role here. The skin forms a tough and elastic physical barrier. In most cases the skin is repares itself. It also has a natural acidic pH value of approximately 5.5. This environment prevents many pathogens from developing if they enter the skin though an abrasion or lesion.

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