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The maintinence of a constant internal environment.

It maintains the right core body temperature and blood pH because these are the two factors affecting enzyme activity, which controls metabolic reactions. 

**Cells need glucose for energy and blood glucose concentration affects water potential of the blood**


When temperature increases the rate of metabolic processes also increases, this is becasue there is more heat therefore more kinetic energy causing molecules to move faster, the substrates are more likely to collide with enzymes, increasing collisions and resulting in a reaction. However if the temperature gets to high the reactions stop, this is due to the enzyme vibrating and breaking hydrogen bonds, this changes the active site causing the enzyme to dentaure and it no longer functions as a catalyst. If the temperature is to low enzyme activity is reduced slowing the rate


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