Arrange the following events of an action potential in a proper sequence.
(a) Repolarisation
(b) Influx of Na⁺
(c) Efflux of K⁺
(d) Depolarisation

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(b), (a), (c), (d)

(c), (d), (b), (a)

(b), (c), (d), (a)

(b), (d), (c), (a)

answer is B.

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Detailed Solution

Sequence of events occuring when a neuron is stimulated.

(b) Influx of Na⁺(Sodium ions rush into the neuron due to the opening of voltage-gated sodium channels in the axon membrane)
(d) Depolarization (The influx of Na⁺ causes the inside of the neuron to become more positive)
(c) Efflux of K⁺ (Potassium ions begin to leave the neuron due to the opening of voltage-gated potassium channels)
(a) Repolarization (The efflux of K⁺ causes the inside of the neuron to become more negative again, returning to its resting membrane potential)

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