The nervous system

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  • The Nervous System
    • Response
      • Effecter organ (muscle or gland)
        • Motor neurone
          • CNS (relay neurone)
            • Sensory neurone
              • Sensory receptor
                • Stimulus
                  • Sound of starting pistol
                • Sound receptor in ear
              • Sensory neurone
            • Processes information
          • Motor neurone
        • Muscle in feet
      • Will start running
    • Sense organs
      • Nose
        • Smell, chemical
          • Light
            • Receptors
              • Smell, chemical
                • Light
                  • Receptors
        • Ears
          • Sound, balance
          • Tongue
            • Taste, chemical
            • Eyes
              • Skin
                • Touch, pressure, pain, temp
              • Neurones
                • Relay neurone the nerve cell that caries signals from the sensory neurone to the motor neurone (In the CNS!)
                • Sensory neurones carry signals as electrical impulses from the receptors in sense organs to the CNS
                • Motor neurone the nerve cell that carries signals from the CNS to the effector muscles or glands
                • Effectors these are muscles and glands they respond in different ways. Muscles contract in response where as glands secrete hormones
              • Reflexes
                • Reflexes  bypasses the conscience brain completely when a quick response is essential
                • Help prevent injury, automatic responses to certain stimuli
                • For example if someone shines a bright light in your eye your pupils automatically get smaller to reduce the amount of light let in, also if you get a shock your body releases the hormone adrenaline automatically
                • The passage of information in a reflex (from receptor to effector) is called a reflex arc.
              • Synapses
                • Synapses connect neurones
                  • The connection between two neurones is called a synapse
                    • The nerve cell is transferred by chemicals which move across the gap
                      • These chemicals  then set off a new electrical signal in the next neurone
              • Reflex arc
                • Stimulus
                  • Receptor
                    • Sensory neurone
                      • Relay neurone
                        • Motor neurone
                          • Effector
                            • Response
                              • Muscle contracts
                            • Muscle
                          • Impulses travels along a motor neurone via a synapse
                        • Impulses are passed along the relay neurone via a synapse
                      • Impulse travel along the sensory neurone
                    • Stimulation of pain receptor
                  • Bee stings finger
            • Sensory neurone
              • Relay neurone
                • Motor neurone
                  • Effector
                    • Response
                      • Muscle contracts
                    • Muscle
                  • Impulses travels along a motor neurone via a synapse
                • Impulses are passed along the relay neurone via a synapse
              • Impulse travel along the sensory neurone

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