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B2.5 Homeostasis

5.1 Controlling Internal Conditions
The processes in your body that help to maintain a constant internal environment are known as

Just think of the different temperatures we experience:

Your body also has to cope with varying rates of respiration needed in different activities:

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B2.5 Homeostasis


We can investigate the effect of
exercise on our breathing using the equipment below:

Carbon dioxide is a waste product of respiration it is excreted through the lungs.
Some of the amino acids we take in are not used. They are converted into urea by the

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B2.5 Homeostasis

We must remove the waste products produced through chemical reactions from the
There are other factors we must keep within certain limits, e.g. water and ion content of
the cells.

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B2.5 Homeostasis

5.2 Controlling Body Temperature
The thermoregulatory centre of the brain and receptors in the skin detect changes in
temperature. The thermoregulatory centre controls the body's response to a change in internal

If the core temperature rises:

Blood vessels near the surface of the skin dilate allowing more…

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B2.5 Homeostasis

5.3 Controlling Blood Sugar
The pancreas monitors and controls the level of sugar in our blood.

If there is too much sugar in our blood the pancreas produces the hormone insulin that results in
the excess sugar being stored in the liver as glycogen. If insulin is not…


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