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Thermoregulation
The body maintains a temperature of 370C because enzymes needed for chemical reactions in your
body work best at this temperature
...
it
The hypothalamus, a small part of the brain constantly monitors body temperature — acts like a
in the brain
...
It contains receptors that are sensitive to blood temperature
temperature drops below 370Cthen the hypothalamuscauses muscles to shiver, to release heat
...
When skin temperature changes are detected by the hypothalamus it causes a response in the
dermis of the skin:
When your too cold
When your too hot
Erector muscles relax so hairs lie flat
...
When the sweat evaporates it transfers heat from your
skin to the air, cooling you down
...
This is called vasodilation and it allows more blood to
flow near the surface of the skin so it can transfer more
heat into the surroundingair
...
This traps an insulating layer of air
next to your skin, which slows down the
heat lost from the skin
...
Very little sweat is produced so very little
heat is transferred due to evaporation
...
This is
called vasoconstriction
...
sebaceous gland
produces sebum (oil)
io moisturise the skin
no sweat
temperature
receptors
(nerve endings)
sweat gland
hair erector muscle
blood vessels widen
hairs erect
blood supplg shut off