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🔬 Biology  ·  Neural Control and Coordination  ·  NEET

Nodes of Ranvier are gaps in the:

Answer: Myelin sheath exposing the axon membrane.

  • A Axon itself, where the cytoplasm is interrupted
  • B Myelin sheath exposing the axon membrane
  • C Cell body, where the nucleus and organelles are located
  • D Dendrites, where incoming signals are received

Correct answer: B. Myelin sheath exposing the axon membrane

Explanation: Nodes of Ranvier: gaps in the myelin sheath where the axon membrane is exposed. Action potentials regenerate here, enabling saltatory conduction.

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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