Answer: Myelinated neurons (impulse jumps between nodes of Ranvier).
- A Unmyelinated neurons that conduct impulses continuously
- B Myelinated neurons (impulse jumps between nodes of Ranvier)
- C Mainly sensory neurons carrying afferent signals to the CNS
- D Mainly motor neurons carrying efferent signals to muscles
Correct answer: B. Myelinated neurons (impulse jumps between nodes of Ranvier)
Explanation: Saltatory conduction: in myelinated neurons, action potential jumps from one node of Ranvier to the next, greatly speeding conduction.
Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.