One limiting factor in the ability of damaged axons to regenerate in the brain and spinal cord is that:
A) they don't have any myelin to guide them.
B) they regenerate only one to two millimeters.
C) growing dendrites compete with growing axons.
D) there are no muscles in the brain and spinal cord to guide the growth.

Question

Quizplus · Accepted Answer

Axons in the brain and spinal cord have a limited ability to regenerate, typically only one to two millimeters. This is due to various factors, including the lack of a supportive environment for axonal growth and the presence of inhibitory molecules in the nervous system. While myelin can play a role in axonal guidance, it is not the primary limiting factor in regeneration. Similarly, while dendrites may compete with axons for space, this is not the primary limitation on regeneration. The absence of muscles in the nervous system is not directly relevant to axonal regeneration.

One Limiting Factor in the Ability of Damaged Axons to Regenerate