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Q.

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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a

(c) (d)(b)(a)

b

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

c

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

d

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

answer is B.

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Detailed Solution

A stimulus increases permeability to Na+ leading to a rapid influx of Na+. This causes depolarisation. Depolarisation is followed by a rise in permeability to K+ due to which K+ diffuses out. This causes repolarisation.

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