The Nervous System

The Nervous system and what it consists of

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  • The Nervous system is made of
    • sense organs
      • detect stimuli-- a change in the environment
        • a stimulus can be light, sound, touch or change in position or temp
        • eyes,ears, nose, tongue and skin
          • contain receptors- sensitive to stimuli- change stimulus energy to electrical impulses
          • Eyes- Light Receptors-> sensitive to light.
            • These cells have a nucleus, cytoplasm and cell membrane
          • Ears- sound receptors, balance recpetors
            • sensitive to changes in position and sound
          • Nose- smell receptors--> sensitive to chemical stimuli
          • Tongue- taste receptors. chemical stimuli
            • sensitive to bitter, salt, sweet, and sour + the taste of savoury l
              • Chemical Stimuli
          • Skin- sensitive to touch, pressure, pain and temperature change
      • eyes,ears, nose, tongue and skin
        • contain receptors- sensitive to stimuli- change stimulus energy to electrical impulses
        • Eyes- Light Receptors-> sensitive to light.
          • These cells have a nucleus, cytoplasm and cell membrane
        • Ears- sound receptors, balance recpetors
          • sensitive to changes in position and sound
        • Nose- smell receptors--> sensitive to chemical stimuli
        • Tongue- taste receptors. chemical stimuli
          • sensitive to bitter, salt, sweet, and sour + the taste of savoury l
            • Chemical Stimuli
        • Skin- sensitive to touch, pressure, pain and temperature change
      • sense organs are not receptors- they contain them- eyes contain- light receptors etc
    • Effectors
      • Muscles and Glands
        • Muscles contract as a response to nervous impulses
        • Glands secrete hormones as a response to nervous impulses
    • Motor Neurones
      • nerve cells that carry signals from the CNS to effector muscles and glands
    • Relay neurones
      • cells that carry signals from sensory neurons to motor neurons
    • Sensory Neurons
      • C ells that carry signals as electrical impulses from receptors to the CNS
    • the Cental nervous system-- where all the information from sense organs is sent.
      • where reflexes and actions are coordinatied
      • Consists of the Brain and the Spinal cord
      • Neurones transmit information as electrical impulses to and from the cns
      • "instructions" from the CNS are sent to the effectors which respond accordingly

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