CO-ORDINATION AND CONTROL

Revision cards on Co-ordination and control.

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RESPONDING TO CHANGE

  • Hormones, secreted by special glands, are chemicals that help control and co-ordinate processes in your body.
  • The nervous system uses electrical impulses to enable you to react to your surroundings and co-ordinate what you do.
  • Cells called receptors detect stimuli ( changes in the environment).
  • Impulses from receptors pass along sensory neurones to the brain. Impulses are sent from the brain to the effector organs along the motor neurones.
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REFLEX ACTIONS

  • Some responses to stimuli are automatic and rapid and are called reflex actions.
  • Reflex actions run everyday bodily functions and help you to avoid danger.
  • stimulus ---> receptor ---> co-ordinator ---> effector ---> response
  • Reflex actions involve just three types of neurone. These are;

1. sensory neurones

2. motor neurones

3. relay neurones which simply connect a sensory neurone and a motor neurone. We find relay neurones in the CNS, often in the spinal chord.

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