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Slide 1

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Homeostasi…read more

Slide 2

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Body temperature
All enzymes work best at a certain
temperature. The enzymes in the human
body work best at about 37 degrees ­ So
this is the temperature your body tries to
A part of the brain acts as a
personal thermostat. It's Body
sensitive to the blood temperature
temperature in the brain, and is kept at 37
it receives messages from the degrees
skin that provide information
about skin temperature.…read more

Slide 3

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Too hot Too cold
· Hairs stand on end to trap an
· Hairs lie flat
insulating layer of air which
· Lots of sweat is produced
helps you keep warm
(when it evaporates it
· Very little sweat Is produced
transfers heat from you to the
· Blood vessels constrict
environment which cools you
· You shiver to create kinetic
energy which creates heat in
· Blood vessels dilate
the muscles.
· You can take off layers of
· You can put on more clothes
to trap the heat in…read more

Slide 4

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Blood sugar levels
High Low
When blood sugar levels are high, the When blood sugar levels are low, the
pancreas, produces a hormone called pancreas produces another hormone but
insulin into the blood stream. This makes this is called glucagon. Glucagon breaks
the liver store the glucose as glycogen. down the glycogen that is stored in the
liver so that there is more glucose in the
blood stream.…read more

Slide 5

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Ion content is regulated by
Kidneys Removal of Urea is
controlled by the kidneys.
the kidneys. Ions like Proteins can't be stored by
sodium are taken into the the body so any excess
body from food then amino acids are converted
absorbed into the blood. If into fats and carbohydrates
food contains too much of which can be stored. This
any kind of ion then the process happens in the liver.
excess ions need to be Urea is produced as a waste
removed from the blood. product from the reactions.
Some of the ions are lost in Urea is poisonous and is
sweat and then the rest will released into the
be removed from the blood bloodstream by the liver.
by the kidneys and then lost The kidneys then filter it out
in urine. This needs to of the blood and it's
happen because if the levels excreted from the body's
of ions are wrong then this urine.
can cause too much or too
little water being drawn into
cells by osmosis which can
damage the cells.
Adjustment of water content. Water is taken into the body by food and drink and is lost from
the body by sweating, urine and in the air we breathe out. The body has to constantly
balance the water coming in against the water going out. Your body can't control how much
you lose in your breath, but it can control the other factors. This means the balance is
between: Liquids consumed, Amount sweated out, Amount excreted by the kidneys in the
urine.…read more


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