Biology Unit 1

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The Nervous System

Sense Organs Detect Stimuli

  • A stimulus is a change in your enviroment, You may react to this (such as standing on a pin) You need to be aware of whats going on around you, so you can respond if you need to.
  • You have 5 different sense organs, eyes,ears,nose,tongue and skin
  • They all contain differnt Receptors, Receptors are groups of cells which are sensitive to a stimulus. The change the stimulus energy. (light engergy in


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