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When you state that the neuron's membrane is polarized, you are reerring to a difference in electrical potential between:
the inside and the outside of the membrane
A membrane produces an action potential whenever the potential across it reaches what level?
the threshold of excitation
the resting potential of a neuron refers to:
the net negative charge on the inside of the neuron
when a membran is at rest, what attracts sodium ions to the inside of the cell?
both an electrical gradient and a concentration gradient
when the neuronal membrane is at rest, the sodium channels: