2015年 08月 05日
the evaporation of sweat f |
Instead, they focused solely on the mechanisms by which the evaporation of sweat from the skin’s surface allowed the body to cool itself .
But McSwiney knew that there was more to sweating than just evaporative cooling. Under certain conditions “the loss of constituents of blood-plasma by continued sweating may be considerable”. In other words, other stuff leaves the body in our sweat. But what kind of stuff, and is its loss a good thing or bad ?
Some substances in our sweat we probably wouldn’t want to lose. Take chlorides. These compounds – chlorine atoms, often attached to sodium ones to form salt – are important for maintaining the body’s internal pH balance, regulating the movement of fluids in and out of cells, and transmitting impulses across nerve fibres. It’s normal for some chlorides to leak out of the body as we sweat, but there are some instances in which a person might lose too many. Imagine working for several hours in a hot place, for example. Most of us would know to drink water to stay hydrated. But sweat too much and drink too much and you might start to show symptoms of water poisoning. In those circumstances the body just can’t replace the chloride lost in sweat fast enough .
But McSwiney knew that there was more to sweating than just evaporative cooling. Under certain conditions “the loss of constituents of blood-plasma by continued sweating may be considerable”. In other words, other stuff leaves the body in our sweat. But what kind of stuff, and is its loss a good thing or bad ?
Some substances in our sweat we probably wouldn’t want to lose. Take chlorides. These compounds – chlorine atoms, often attached to sodium ones to form salt – are important for maintaining the body’s internal pH balance, regulating the movement of fluids in and out of cells, and transmitting impulses across nerve fibres. It’s normal for some chlorides to leak out of the body as we sweat, but there are some instances in which a person might lose too many. Imagine working for several hours in a hot place, for example. Most of us would know to drink water to stay hydrated. But sweat too much and drink too much and you might start to show symptoms of water poisoning. In those circumstances the body just can’t replace the chloride lost in sweat fast enough .
by hcoco6
| 2015-08-05 19:56