Neural Control and Coordination · NEET Preparation Zoology
Which sequence correctly describes the major ionic events during an action potential in a neuron?
Practice question from Neural Control and Coordination (NEET Preparation Zoology), with the correct answer and a step-by-step solution.
medium · MCQ · Q-E12457
Which sequence correctly describes the major ionic events during an action potential in a neuron?
- A.Opening of voltage-gated K+ channels followed by Na+ influx and depolarisation
- B.Opening of voltage-gated Na+ channels, Na+ influx and depolarisation, followed by K+ efflux and repolarisationCorrect answer
- C.Na+ efflux followed by K+ influx, causing depolarisation
- D.Simultaneous opening of Na+ and K+ channels causes only hyperpolarisation
Solution
When the threshold is reached, voltage-gated Na+ channels open and Na+ enters the axon, producing depolarisation. Subsequently, K+ channels open and K+ leaves the axon, bringing about repolarisation.
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