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The sudden inflow of which ion causes depolarisation of a neuron?

Answer: Sodium (Na + ).

  • A Potassium (K<sup>+</sup>)
  • B Calcium (Ca<sup>2+</sup>)
  • C Chloride (Cl<sup>-</sup>)
  • D Sodium (Na<sup>+</sup>)

Correct answer: D. Sodium (Na<sup>+</sup>)

Explanation: When Na<sup>+</sup> channels open, sodium rushes in and the membrane depolarises, generating the action potential.

Labeled diagram of a neuron showing dendrites, cell body (soma) with nucleus, axon, myelin sheath, Nodes of Ranvier, and axon terminals

Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.

Concept context

Brain, spinal cord, neurons, reflex arcs, and sense organs.

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