In myelinated axons, the channels found in the nodes of Ranvier are
A) similar to the channels found on the dendrites
B) similar to the channels found on sensory receptors
C) similar to the channels found in the axon hillock
D) unique and unlike channels found anywhere else in the neuron

Question

Quizplus · Accepted Answer

The channels found in the nodes of Ranvier are voltage-gated sodium channels, which are also found in the axon hillock. These channels are responsible for generating action potentials, which propagate down the axon. The channels found on dendrites are typically ligand-gated ion channels, which are responsible for synaptic transmission, and the channels found on sensory receptors vary depending on the type of receptor. Therefore, the nodes of Ranvier are unique in that they have a high concentration of voltage-gated sodium channels, which allows for the efficient propagation of action potentials in myelinated axons.

In Myelinated Axons, the Channels Found in the Nodes of Ranvier