Central Nervous System

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  • Central Nervous System
    • Types Of Neurons
      • Sensory Neurons:Carry messages from sensory receptors along the nerves in the PSN to the CNS.
      • Motor Neurons; Carries messages from the CNS to effectors such as muscles and glands
      • Relay neurons: Connect sensory and motor neurons together, and also connect to other relay neurons
    • Function Of The Neurons
      • When activated by a stimulus, the inside of a neuron becomes positively charged for a split second
        • The rapid switch from negative to positive is called depolarisation
      • An electrical impulse is created from the axon to the terminal buttons.
      • AP is generated once depolarisation reached the threshold and is always the same intensity, regardless of the size of stimuli
        • AP = Action Potential
    • Synaptic Trasmission
      • Signals within neurons are transmitted elecrically, BUT signals between neurons are transmitted chemically across the synapse
      • Once the AP reaches the end on the neuron, it triggers the release of neurotransmitters from the synaptic vesiles
      • When the neurotransmitter reaches the end of the synapse, it has to fit in the receptor sites of the post synaptic neurons.
        • The transmitters which do not reach the postsynaptic receptors are reabsorbed


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