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Perspiration (also called sweating or sometimes transpiration) is the production and evaporation of a fluid, consisting primarily of water as well as a smaller amount of sodium chloride (the main constituent of "table salt"), that is excreted by the sweat glands in the skin of mammals. Sweat also contains the chemicals or odorants 2-methylphenol (o-cresol) and 4-methylphenol (p-cresol).
In humans, sweating is primarily a means of thermoregulation, although it has been proposed that components of male sweat can act as pheromonal cues . Evaporation of sweat from the skin surface has a cooling effect due to the latent heat of evaporation of water. Hence, in hot weather, or when the individual's muscles heat up due to exertion, more sweat is produced. Sweating is increased by nervousness and nausea and decreased by cold. Animals with few sweat glands, such as dogs, accomplish similar temperature regulation results by panting, which evaporates water from the moist lining of the oral cavity and pharynx. Primates and horses have armpits that sweat similarly to those of humans.
How sweat glands operate
Sweat glands are innervated by the sympathetic nervous system. The nerve terminal releases acetylcholine, which binds to M3 receptors on the sweat gland and causes the secretion of sweat. Acetylcholine is partially degraded by Cholinesterase enzyme (AchE); thus anything which interferes with AchE activity causes excessive sweating.
There are two kinds of sweat glands, and they differ greatly in both the composition of the sweat and its purpose:
This means that sweating is extremely common in the hand area and the armpit area. Normally if you carry excess body weight, you tend to sweat quite excessively around the armpit area.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Perspiration". A list of authors is available in Wikipedia.|