Positive and negative feedback mechanisms


Positive and negative feedback mechanisms


Multiple negative feedback mechanisms give more control


  1. Homeostasis involves multiple feedback mechanisms for each thing being controlled. This is because having move than one mechanism gives more control over changes in your internal environment than just having one negative feedback mechanism.
  2. Having multiple negative feedback mechanisms means you can actively increase or decrease a level so it returns to normal. E.g. you have feedback mechanisms to reduce your body temperature and you also mechanisms to increase it.
  3. If you only had one negative feedback mechanism, all you could do would be to turn it on or turn it off. You would only be able to actively change a level in one direction so it returns to normal e.g. It’s a bit like trying to slow down a car with only an accelerator ( you’d have more control with


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