Responding to Change

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  • Created by: Annie
  • Created on: 14-01-13 17:32
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  • Responding to Change
    • Nervous System
      • Enables you to react to surroundings and co-ordinate your behaviour
    • Impulses
      • Electrical signals which travel very quickly around your body- they enable you to react very quickly
    • Stimuli
      • A change in your own natural environment
    • Receptors
      • Pick up stimuli
    • Sense Organs
      • (most like animal cells) usually found in large clusters which form organs such as eyes and skin, ears, tongue
    • Neurons
      • Once, Sensory receptor detects a stimulus, it sends information (sent as electrical impulse) down special cells called neurons. Which can be found in large bundles. They are called nerves.
    • CNS
      • The impulse travels along until it reaches CNS. Brain, Spinal Chord.
    • Sensory Neurons
      • Cells which carry impulses from sense organs.
    • Motor Neurons
      • The brain gets huge amounts of info from all sensory receptors. It co-ordinates all the information and sends impulses along cells. they carry info from CNS to the rest of your body.
    • Effector Organs
      • A MUSCLE OR GLAND. They respond to impulses by contracting.
    • Secreting
      • Muscles respond by releasing chemicals


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