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  •  What would you call potential difference in an axon at rest and an axon in action?Option: 1 Depolarisation and action poten

 What would you call potential difference in an axon at rest and an axon in action?

Option: 1

Depolarisation and action potential respectively


Option: 2

Resting potential and action potential respectively


Option: 3

Action potential and resting potential respectively


Option: 4

Repolarisation and depolarisation respectively


Answers (1)

best_answer

As we have learnt in Resting Potential (Polarization):

    • When an axon is resting, its membrane is polarized; that is, the outside (ECF) is positive compared to the inside (axoplasm), which is negative.

    • This occurs due to a protein carrier in the membrane, called the sodium-potassium pump, which pumps three sodium (Na^{+})  out of the axon and two potassium (K^{+}) into the axon.

    • Another factor that causes the inside of the axon to be negative compared to the outside is the presence of large, negatively charged protein ions inside an axon.

    • The polarity across an axon that is not conducting nerve impulses is called the resting potential(-70mV)).

    • Such an axolemma is said to be polarised.

    • The polarity of the axon membrane that is now conducting the nerve impulse is called the action potential (+30\; mV).

Hence, the correct answer is option b.

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Rishi

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