In order to survive, organisms need to detect and respond to changes in their external and internal environments.

In this topic you need to know about the following: -

  • What different types of receptors and neurones (nerve cells) there are.
  • How an impulse travels through the nervous system.
  • What reflexes are.
  • How the nervous system can be damaged.

    • Use the arrows below to continue to revise.

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