A change in the environment ____ is detected by special cells called ____ which are found in your ____ organs such as your eyes and your ____. The receptors change the stimulus into an ____ message that can travel along cells called ____. The ____ neuron takes the message from the sense organ to the central nervous system ____. This could be the brain or the ____ cord. This then directs the message to a ____ neurone which sends the message to an ____ which is either a ____ of a ____ that brings about a ____. For example a light stimulus is detected by receptors in the ____ that send a signal to the brain through a sensory neurone. The brain then sends a signal along a motor neurone to the ____ muscles in your eye (the coloured part of your eye) and that brings about a response ____ changes size)

How the nervous system works

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