Re: Kudu talk
- From: Marc Verhaegen <m_verhaegen@xxxxxxxxx>
- Date: Thu, 28 Feb 2008 09:10:11 +0100
Op 28-02-2008 01:14, in artikel
fc347c58-0d7c-4ef7-9322-a158c3ccca0f@xxxxxxxxxxxxxxxxxxxxxxxxxxx, Lee Olsen
<paleocity@xxxxxxxxxxx> schreef:
On Feb 27, 3:42 pm, Marc Verhaegen <m_verhae...@xxxxxxxxx> wrote:
http://www.iht.com/articles/2007/08/15/healthscience/14swea.php
...
Sweat is our interior coolant, part of a uniquely human biologic machine.
Yep, need to sweat on the savanna.
:-D
Savanna Fantasts make up their own facts. Why don't these fools inform a
little bit before opening their big mouths??
Of all mammals, man has the highest sweat production (Newman, 1970).
Montagna (1965) says: ?Sweating is an enigma that amounts to a major
biological blunder; it depletes the body not only of water, but also of
sodium and essential electrolytes¹. But sweating is only one of the
strategies mammals have evolved to prevent overheating. Many small mammals -
such as rodents, marsupials and cats - use saliva instead of sweat for
thermoregulation, spreading it over the more sparsely haired areas of the
skin so that in evaporating it cools the body. Some larger mammals - such as
dogs - reduce their body temperature by panting; others, like horses and
cattle, sweat; sheep do both. But the maximum water loss per unit of skin
surface in these species is always much smaller than in humans (Newman,
1970; Schmidt-Nielsen, pp. 54, 73, 83).
Although camels sweat, they have adapted to their arid environment by
reducing water loss to a minimum; they do this by allowing their body
temperature to rise during the day; the heat thus stored is given up at
night without any expenditure of water. African hunting dogs (which, like
dogs, do not sweat and do not salivate, and, unlike dogs, do not even pant)
use the same strategy: they conserve water both by hiding in holes during
the day and by allowing their body temperature to reach a level which in
humans would be fatal, around 42°C (Kanwisher, 1977).
Of all the available strategies, human eccrine sweating combined with low
body temperature is the least well adapted to savannah conditions and the
least likely to have evolved in that type of habitat. As far as is known,
fur seals are the only non-human mammals which sweat thermoactively through
abundant eccrine glands (on their naked hind flippers) when they are
overheated on land (G. A. Bartholomew, in McFarland et al., 1979, p. 773).
.
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