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Question

The electrical potential difference between outside and inside of a nerve axon before excitation is known as
  1. Resting potential
  2. Action potential
  3. Spike potential
  4. Reaction potential

A
Action potential
B
Spike potential
C
Reaction potential
D
Resting potential
Solution
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The electrical potential difference across the resting plasma membrane is called a resting potential. The resting membrane potential of a neuron is about -70 mV- this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron. So, the correct answer is option A.

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