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homeostasis
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Homeostasis
Balancing
body functions to maintain a "
normal
" state
Conditions in your body need to be kept
steady
so that cells can
function properly
Homeostasis
Balancing inputs (stuff going into your body) with
outputs
(stuff leaving)
Conditions that need to be balanced
Water content
Body temperature
Homeostasis
is the maintenance of a constant
internal environment
Ways water is lost from the body
Through the skin as
sweat
Via the lungs in
breath
Via the kidneys in
urine
On a hot day or when you're exercising
You
sweat
a lot, produce less
urine
which is more concentrated
On a
cold
day or when you're not
exercising
You don't sweat much, produce more
urine
which is
pale
Body temperature
Enzymes work best at around
37°C
The brain acts as a
thermostat
to maintain this temperature
Homeostasis
happens automatically without you having to
concentrate
on it
Skin's
role in maintaining body temperature
Sweating
to cool down
Blood vessels dilating
to allow more
heat loss
Hairs
standing up to trap
insulating air
when cold
Smaller organisms can cool down or heat up faster due to their
higher
surface area to
volume
ratio