If the equilibrium potential of a cation is -40 mV, then opening of channels for this cation will result in excitation of the neuron.

Name: If the equilibrium potential of a cation is -40 mV, then opening of channels for this cation will result in excitation of the neuron.
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Opening of channels for a cation with an equilibrium potential of -40 mV will result in an influx of positive ions, depolarizing the neuron and leading to excitation.

If the Equilibrium Potential of a Cation Is -40 MV