4.6.10 The role of negative feedback in maintaining systems within narrow limits

Negative feedback systems aim to keep something (e.g. blood [glucose] or body temperature) at a constant level.


Negative feedback works as follows;


  1. Signal causes action


  1. Action has effect


  1. Effect removes original




  1. High [glucose] in blood causes insulin release


  1. insulin stimulates liver to take up glucose & convert it into glycogen stores


  1. [glucose] falls