![]() ![]() Many of these chemicals are now being analysed to detect health and hydration levels, and assist in diagnosing diseases such as cystic fibrosis.įrom perspiration to world domination – the extraordinary science of sweat The fluid is approximately 99% water but also contains electrolytes, fatty acids, urea (as found in urine) and lactic acid. Sweating is the release of a water-like fluid from special glands in the skin to help regulate body temperature. Conversely, when it’s too hot, the body sweats, producing fluid from the approximately 4m sweat glands in the skin to help heat evaporate away from the body – cooling us down. When cold, the brain causes these hairs to stand on end, trapping a layer of insulating air next to the skin. ![]() The skin is covered in most places by hair. But there are also more primitive and uncontrollable responses. Nerve fibres detect the temperature of whatever is in contact with the skin and relay this information to the brain, which makes a decision about what to do next – take off a jumper or put on a coat. ![]() The regulation of temperature is complex. It protects the body against pathogens, provides insulation, synthesises vitamin D, provides sensation and most importantly regulates temperature. Skin constantly repairs and replaces itself and performs many functions. It is calculated to weigh approximately three to 4.5kg and, over the course of your life, you will lose about 35kg of skin. The skin is the largest and heaviest organ of the human body.
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