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Keeping the balance


Homeostasis maintain ( keeping ) the internal ( inside )
environment of the body
Our bodies function ( work ) most efficiently ( best ) under
optimum conditions

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Most of these conditions are monitored by the brain
The brain then adjust conditions to keep the balance


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Normal body temperature is 37°C, if it gets to high or low
we could die

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Danger of high and low temperature

Evie knows she must wear the correct clothing and be well
­ equipped for her expedition to help her body keep a
steady internal environment

If she gets to hot from her walk she could suffer from :

Heat stroke, when her skin becomes…

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What your body does

Temperature too high Temperature too low
You sweat more / sweating Sweating decreases to
increases ­ evaporation loses conserve heat
Bodily functions slow down Shivering converts Chemical
Kinetic Heat energy
Vasodilatation ­ When the Vasoconstriction ­ When the
body body is to
gets to hot…

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Temperature regulation

Carbon dioxide

This is kept at a constant level by increasing / decreasing
heart and breathing rate

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Water in the blood is regulated by the kidneys ; they can
absorb more or less and reabsorb the water

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Blood sugar / Glucose

This is regulated by the pancreas

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Diabetics do not produce enough insulin so most have to
inject themselves with insulin
The dose is dependent on diet and exercise

Food increases blood sugar
Exercise decreases blood sugar


The endocrine system in the body containing glands which
realises hormones directly into the blood stream

Endocrine gland Hormone…

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Pancreas Insulin Controls the amount if
sugar ( glucose ) on the
Ovaries ( only in Female sex Controls the female
females ) hormone characteristics e.g.
Testes ( only in Male sex Controls the male
males ) hormone characteristics e.g.
deeper voice and hair on
the body



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