B1.2 The nervous system

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  • B1.2 The nervous system
    • the nervous system is what allows you to respond to changes in the enviroment you are in
    • Allows you to coordinate your actions
    • made up of neurones
    • Stimuli and receptors
      • a change in the environment is called a stimulus
      • Stimuli are detected by groups of cells called receptors
        • they change stimulus energy into electrical impulses
      • Receptors are found in the five sense organs
        • eyes- contain light receptors which are sensitive to light
        • Ears-they contain sound receptors which are sensitive to sound, also contain balance receptors which are sensitive to change in position
        • nose- contains smell receptors which are sensitive to chemical stimuli
        • tongue- contains taste receptors which are sensitive to chemical stimuli
        • skin- receptors sensitive to touch,pain, pressure and temperature change
    • The central nervous system (CNS)
      • where all the information from the receptors is sent and where reflexes and actions are coordinated
      • consists of the brain and spinal cord.
      • neurones transmit information as electrical impulses to and from CNS. This is very quick
      • effectors
        • instructions sent along neurones to the effectors
        • effectors are muscles or glands which respond to nervous impulses and bring about a response to the stimulus
          • respond in two different ways
            • muscles contract
            • glands secrete hormones
      • Different types of neurone
        • Sensory neurones- nerve cells that carry signals as electrical impulses from receptors in sense organs to the CNS
        • Relay neurones- the nerve cells that carry signals from sensory neurones to motor neurones. Found in CNS
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