A&P Neurophysiology Practice Test 2025 – Complete Exam Preparation

Question: 1 / 400

Saltatory propagation occurs in which type of axons, where action potentials move between nodes?

Unmyelinated axons

Myelinated axons

Saltatory propagation occurs in myelinated axons, which are characterized by the presence of myelin sheaths that insulate segments of the axon. This specialization allows action potentials to leap or "saltate" from one node of Ranvier to the next. The nodes are small gaps in the myelin sheath where ion channels are concentrated, enabling the rapid depolarization necessary for action potential propagation.

This method of signal transmission is much faster and more energy-efficient compared to the continuous propagation that occurs in unmyelinated axons, where the action potential must travel along the entire length of the membrane without the benefit of myelin insulation. Myelinated axons thus allow for quick and efficient communication between neurons, playing a crucial role in the functioning of the nervous system.

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Both myelinated and unmyelinated axons

None of the above

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