Describe how different post-synaptic potentials can be summated on a single neuron to determine if that neuron does or does not fire an action potential
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Describe how different post-synaptic potentials can be summated on a single neuron to determine if that neuron does or does not fire an action potential
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Solved in 2 steps
- Define an action potential.Draw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.
