The Nervous System

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  • Created by: alexda
  • Created on: 08-05-14 16:21
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  • The Nervous System
    • A stimulus is a change in environment e.g. light, sound, touch or pressure.
    • Receptors are groups of cell which are sensitive to a stimulus.
    • You have five different sense organs which contain different receptors: eyes, ears, nose, tongue, skin.
    • 1. When a stimulus is detected by receptors in a sense organ electrical impulses are sent along sensory neurone to the CNS.
      • 2. The CNS then sends the electrical impulse to an effector along a motor neurone. The effector then responds to the stimulus.
    • Sensory neurones carry nerve impulses from the receptors in the sense organs to the CNS.
    • Relay neurones carry nerve impulses from sensory neurones to motor neurones.
    • Motor neurones carry nerve impulses from the CNS to the effectors.


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