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Question
On applying threshold stimulus to a nerve
On applying threshold stimulus to a nerve
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Solution
The correct option is C Sodium-potassium pump stops
The sodium-potassium pumps present along the membrane of the axon are responsible for keeping the polarised state of the membrane in which the intracellular fluid is negative and the extracellular fluid is positive. This occurs due to the active efflux of three sodium ions and influx of two potassium ions. However, as soon the threshold stimulus arrives, the voltage-gated sodium channels become active that allow the quick influx of the sodium ions because of which the membrane becomes depolarised. In this condition, the sodium-potassium pumps stop working.Hence, the correct answer is 'Sodium-potassium pump stops'
The sodium-potassium pumps present along the membrane of the axon are responsible for keeping the polarised state of the membrane in which the intracellular fluid is negative and the extracellular fluid is positive. This occurs due to the active efflux of three sodium ions and influx of two potassium ions. However, as soon the threshold stimulus arrives, the voltage-gated sodium channels become active that allow the quick influx of the sodium ions because of which the membrane becomes depolarised. In this condition, the sodium-potassium pumps stop working.
Hence, the correct answer is 'Sodium-potassium pump stops'
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