Myelinated axons have large numbers of ion channels
A)along the entire length.
B) only at the axon hillock and nodes of Ranvier.
C) only at the axon terminals.
D) only at the axon hillock.

Question

Myelinated axons have large numbers of ion channels 
A)along the entire length. 
B) only at the axon hillock and nodes of Ranvier.​ 
C) only at the axon terminals.​ 
D) only at the axon hillock.​

Quizplus · Accepted Answer

Myelinated axons have ion channels concentrated at the nodes of Ranvier, which are the gaps in the myelin sheath. The ion channels at these nodes allow for the rapid propagation of nerve impulses along the axon. While there may be some ion channels at the axon hillock, they are not unique to myelinated axons and therefore do not constitute a defining characteristic of these neurons. Ion channels are not typically found at the axon terminals, as these structures are responsible for releasing neurotransmitters into the synapse rather than transmitting electrical signals.

Myelinated Axons Have Large Numbers of Ion Channels