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🔬 Biology  ·  Neural Control and Coordination  ·  NEET

For every 2 potassium ions it pumps in, the sodium-potassium pump pumps out:

Answer: Three sodium ions.

  • A Three sodium ions
  • B Two sodium ions
  • C One sodium ion
  • D No sodium ions

Correct answer: A. Three sodium ions

Explanation: The Na+/K+ pump exports 3 Na+ for every 2 K+ it imports, maintaining the resting 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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