12.3: Synapses

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4 Terms

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Synapse

  • place where neuron connects to another neuron or effector

  • two types

    • chemical and electrical

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Electrical synapse

  • presynaptic and postsynaptic neurons bound together by gap junctions

  • fast: no synaptic delay in passing electrical signal

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Chemical Synpase

  • presynaptic neuron’s axon terminal produces signal

  • postsynaptic neuron receives signal (commonly with one of it’s dendrites

  • synaptic cleft: fluid-filled gap between neurons, events of synaptic communication, NT molecules released from vesicles of synaptic knob, NT diffuses across cleft binds to postsynaptic receptors, binding of NT initiates postsynaptic potential (a graded potential)

  • synaptic delay: takes time for these events

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