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Biology 4 Revision Notes

Homeostasis means the maintenance of a constant internal environment.
The body needs to keep certain things the same to stay healthy. There are six things that need
to be controlled:
1) Body Temperature
2) Water levels - if not, too much water could enter/leave cells by…

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The Eye


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The skin is a barrier to the outside world against bacteria etc.
The skin is also very sensitive to we can feel things
The skin's main function is temperature control. Below is how the skin is able to change
the body's temperature
Cooling the body:
Blood capillaries widen (vasodilatation) to…

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