GCSE Biology

GCSE Biology


The Nervous System

  • Sense Organs detect stimuli - a change in environment which the organ can react quickly to.
  • The sense organs have different receptors. These are a group of cells which are sensitive to a stimulus. They change stimulus energy to electrical impulses.
  • A stimulus can be light, sound, taste, touch, pressure, or a change in position or temperature.
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The Central Nervous System

  • The central nervous system co-ordinates a respnse. It's where all the information from sense organs are sent, and where reflexes and actions are co-ordinated.
  • The CNS is only the brain and the spinal cord.
  • The neurones transmit the information to and from the CNS.
  • In
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