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Question

A resting neuron is (i)_____ and has a membrane potential of (ii)______.

A

(i) Polarized (ii) -55mV

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B

(i) Electrochemically neutral (ii) 0 mV

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C

(i) Hyperpolarized (ii) -100mV

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D

(i) Polarized (ii) -70mV

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Solution

The correct option is D

(i) Polarized (ii) -70mV


A resting neuron is polarized at a membrane potential of -70mV, with greater negative charge inside. When there is a change in the membrane potential with the inside becoming more positive, the neuron is depolarized. If the membrane potential drops to below the normal resting state of -70mV, the neuron is hyperpolarized. Cells do not stay in a state of electrochemical neutrality because there is an uneven distribution of ions across a cell membrane.


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