sweat

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sweat

or

perspiration,

fluid secreted by the sweat glands of mammalian skin and containing water, salts, and waste products of body metabolism such as urea. The dissolved solid content of sweat is only one eighth that of an equal volume of urine, the body's main vehicle of salt excretion; however, excessive sweating may produce severe salt loss (see heat exhaustionheat exhaustion,
condition caused by overexposure to sunlight or another heat source and resulting in dehydration and salt depletion, also known as heat prostration. The symptoms are severe headaches, weakness, dizziness, blurred vision, and sometimes unconsciousness.
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). Human sweat glands are of two types, eccrine and apocrine. The eccrine glands, found everywhere on the body surface, are vital to the regulation of body temperature. Evaporation of the sweat secreted by the eccrines cools the body, dissipating the heat generated by metabolic processes. The release of such sweat is usually imperceptible; yet even in cool weather an individual will lose from 1 pt to 3 qt of fluid per day. Only when environmental conditions are especially hot or humid, or during periods of exercise or emotional stress, does the output of sweat exceed the rate of evaporation, so that noticeable beads of moisture appear on the skin. When such conditions are extreme, the body may lose up to 20 qt of fluid per day. Production of sweat is controlled by the temperature-regulating center of the hypothalamus. The apocrine glands, which occur only in the armpits and about the ears, nipples, navel, and anogenital region, are scent glands. They function in response to stress or sexual stimulation, playing no part in temperature regulation. The apocrines exude a sticky fluid quite different from the watery sweat of the eccrines. Apocrine fluid is rich in organic substances that are odorless when fresh but are quickly degraded by bacteria on the skin to produce characteristic odors. Copious sweating in the armpits comes not from the apocrines but from the eccrines interspersed among them.

Sweat

 

a colorless, slightly opalescent fluid secreted by the sweat glands.

Human sweat contains 98 to 99 percent water, about 0.1 percent urea, uric acid, creatinine, serine, fats, volatile fatty acids, cholesterol, and alkaline metal salts, including chlorides (NaCl predominates— about 0.3 percent), phosphates, and sulfates, as well as sulfuric acid esters and aromatic oxygen acids. The secretion of the sebaceous glands is always mixed with the sweat that gathers on the skin surface. The composition of sweat depends on the condition of the body, the intensity of sweat excretion, and the presence of various substances in the blood. Sweat may be acid, with a pH of 3.8–6.2, or alkaline, when there is decomposition of urea and production of ammonia. In man from 0.5 to 10 liters of sweat or more per day are excreted, depending on intensity of muscle work, temperature of the external environment, and the quantity of water imbibed. Thus, with heavy muscle work, sweat contains a significant quantity of lactic acid and nitrogenous substances. In pathological states, sweat may contain glucose (sugar diabetes), bile pigments, cystine (cystinuria), and sometimes erythrocytes (bloody sweat).

sweat

[swet]
(chemistry)
Exudation of nitroglycerin from dynamite due to separation of nitroglycerin from its adsorbent.
(metallurgy)
Exudate of low-melting-point constituents from a metal on solidification.
(physiology)
The secretion of the sweat glands. Also known as perspiration.
(science and technology)
Formation of moisture beads on a surface as a result of concentration.

sweat

1. the secretion from the sweat glands, esp when profuse and visible, as during strenuous activity, from excessive heat, etc.; commonly also called perspiration
2. Chiefly US an exercise gallop given to a horse, esp on the day of a race
References in periodicals archive ?
The son of Montjeu had won his previous two starts on fast ground (1m2f and 1m4f) without breaking sweat and the subsequent hike up the weights might well be overcome by the improvement that is bred to be forthcoming over today's 1m6f.
However, he found the Scot a different proposition with the defending champion winning without breaking sweat.
Thankfully, our skipper has that and he showed our forwards how to tuck them away without breaking sweat
Leicester breezed past Nottingham and London Broncos without breaking sweat and were easily the better team in a tough semi-final win over Saracens.
So before you set foot outdoors, read our GIY guide - we've done the groundwork so you can cherry pick the bloomin' marvellous deals without breaking sweat.
The British No 1 was far too strong for the Spaniard, barely breaking sweat as he cruised to a 6-1 6-1 6-2 victory in just one hour and 22 minutes, to set up a last 16 meeting with either Austrian 11th seed Jurgen Melzer or Cypriot Marcos Baghdatis.
And they were proved right as he eased his way past Simon Whitlock into Sunday's final without breaking sweat before completing an 18-12 win against Raymond van Barneveld to secure an 11th title.
USAIN BOLT sauntered into the second round of the 200m, the Jamaican 100m champion barely breaking sweat as he came home in 20.
Even without their top half dozen or so superstars they still thought they had enough talent to win gold without breaking sweat.