Central nervous system axons regenerate much better in fish than in mammals because:
A) fish nerves do not have to travel so far to reach their target.
B) fewer fish nerves are covered with myelin.
C) fish do not produce as much scar tissue.
D) fish generally have a lower body temperature.

Question

Quizplus · Accepted Answer

Fish do not produce as much scar tissue as mammals, which allows for better regeneration of axons in the central nervous system. Scar tissue can inhibit and prevent axon regrowth, so the lower amount of scar tissue in fish is a significant factor in their superior regenerative ability.

Central Nervous System Axons Regenerate Much Better in Fish Than