Practice Questions

1.Define the term homeostasis

Homeostasis is the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.

2. Outline the importance of maintaining core body temperature

Enzymes work best under certain conditions, their activity is affected by temperature and pH. 

Each enzyme has an optimum temperature where it has the maximum rate of reaction. 

If the temperature is too low, then the rate of reaction will be too slow to sustain life. 

If the temperature is too high, then the enzyme is denatured and the reaction will stop, so life cannot be sustained. 

3. Name the three main parts to a control system.

Receptors, coordination centres and effectors