system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't brain cells regenerate when other cells of the body can?
gpt
Brain cells do regenerate, though at a much slower rate. This slow rate is to ensure the neurons grow exactly as they should. When damage occurs to the brain however, scar tissue forms quickly, much quicker than new neurons. The scar tissue is too thick for the new neurons to grow through, effectively rendering that area of the brain unable to regenerate.