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bio paper 2
thermoregulation
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Thermoregulation
is the control of
internal body temperature
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Homeostasis
refers to maintaining a
stable internal environment
within our body
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Body temperature needs to be kept around
37
degrees Celsius for enzymes to function optimally
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Thermoregulatory
sensor in the
hypothalamus
acts as a
thermostat
for the body
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Receptors throughout the body detect
changes
in body
temperature
, with many found in the
skin
and
blood vessels
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If the brain detects the body is too
hot
, it sends signals to
cool down
; if too
cold
, it brings about changes to
warm up
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To warm up:
Constrict
blood vessels near the skin surface (
vasoconstriction
) to reduce
heat loss
Contract
erector muscles
to trap
insulating air
and prevent
heat loss
Shiver
, which doesn't directly produce
heat
but requires
energy
, releasing
heat
as
waste
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To cool down:
Relax
erector muscles to allow
heat
loss
Expand blood vessels near the skin surface (
vasodilation
) to transfer more heat to the surroundings
Produce
sweat
, which
evaporates
and takes
heat energy
away from the body,
cooling
us down
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