sweat

(redirected from sweat blood)
Also found in: Dictionary, Thesaurus, Medical, Idioms.
Related to sweat blood: hematidrosis

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.
..... Click the link for more information.
). 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 ?
Every player on the training field Monday was bubbly, everyone was up for this game and everyone is going to sweat blood on the night," Gardner told the Birmingham Mail.
Malouda finished the season at Stamford Bridge in great form with seven goals in his last 13 matches, and at least he looks as though he's willing to sweat blood for the cause - unlike one or two of his more illustrious (and shorter-priced) team-mates.
That's why fans have every right to expect every player to sweat blood for Boro in every game.
You have got to prove to Newcastle fans you want to play and you want to sweat blood for them, and Dyer seems to be doing that
And although Moore is uncomfortable with the tag of favourites sitting on their shoulders when they tackle Copenhagen in the first leg of their Champions League qualifier, he insists they will sweat blood to make it to the promised land.
He seems prepared to sweat blood for the shirt and work for his team.
The net effect: the government of Mexico still owes Citibank the dollars, for which it must sweat blood and export enough oil to pay it off: but the dollars are now invisible, safe from regulatory authorities in Switzerland, in private hands, owed to no one, locked up in a house in the American suburbs.
JIM McALISTER grew up watching John Brown sweat blood for Rangers and reckons his new gaffer's never-say-die spirit is now rubbing off on Dundee.
The philanthropists of Robert Tressell's classic socialist novel are the decorators who sweat blood to renovate a rich man's house.
For thirteen years he has pulled on that red shirt and been prepared to sweat blood for it every time.
Brothers Tato (Garcia Bernal) and Beto (Luna) sweat blood and tears on the banana plantations to keep a roof above the head of their mama (Dolores Heredia).