B6-The nervous system

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  • B6-The nervous system
    • Different parts
      • Central nervous system (CNS)
        • It is a processing centre
        • Co-ordinates responses after receiving information from the receptors
      • sensory neurones
        • Carry impulses from receptors to CNS
      • Motor neurones
        • Carries impulses from CNS to effectors.
      • Effectors
        • There are two types of effectors
          • Muscle cells which make muscles
          • Hormone secreting cells, these are found in glands
      • Receptors
        • Cells that detect stimuli
        • Different types eg, taste and sound
        • They respond to nervous impulses and bring about a change.
        • They can from part of larger complex organs, eg The retina in the eye is covered in light receptor cells.
    • Stimulus
      • Receptor
        • Sensory neurone
          • CNS
            • Motor neurone
              • Effector
                • Response
      • Neurones are nerve cells
        • Not attached to each other
        • Infrormation is transmitted around the body by neurones
        • When stimulated, neurones transmit information around the body as electrical impulses.
      • The gap between two neurones is a synapse
      • When an electrical impulse reaches the end of a neurine it triggers the release of transmitter chemicals into the synapse
        • Transmitter chemicals diffuse across the gap and bind to receptor molecules on the membrane of the next neurone.
          • Only specific transmitter chemicals can bind to the receptor molecules on the neurone.
            • When chemicals bind to the correct receptors they trigger a new electrical impulse in the next neurone
      • Some drugs affect transmission across synapses
        • Eg, ecstacy, beta blockers and PROZAC.



extremely useful 

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