The Nervous System

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  • The Nervous System
    • Organisms need to respond to stimuli in order to survive.
    • Cells in multicellular organisms need to communicate with each other first . So they developed nervous and hormonal communication systems
    • Is made up of different parts:
      • The CNS (Central Nervous System)
        • Consists of the brain, spinal cord, sensory neurones and motor neurones.
      • Sensory Neurons
        • Neurones that carry information as electrical impulses from the receptors to the CNS
      • Motor Neurons
        • Carry electrical impulses from the CNS to effectors
      • Effectors
        • All your muscles and glands which respond to nervous impulses
          • Muscles contract and glands secrete hormones
    • Receptors are the cells that detect stimuli
    • There are many different types of receptors e.g. taste and sound
      • They respond to nervous impulses
    • The CNS coordinates a response
      • It receives information about the receptors and then coordinates a response
  • Stimulus
    • Receptor
      • Sensory Neurone
        • CNS
          • Motor Neurone
            • Effector
              • Response

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