system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: I understand how my body heals itself on the outside, but can someone explain what the process is on the inside. Not just like a simple cut, but more like a sore on the stomach lining or even a gunshot wound.

Had a Shower thought, but I actually wanted to understand it. I'm literate so go ahead and give me the actual process don't hold back.

Edit: First comment covered a small, but helpful amount of Information. I would like to go (deeper ;) ) more in depth. I am quite intrigued by this function in my body.
gpt
White blood cells clean up the area of bacteria and junk

Platelets and clotting factors help reduce bleeding

Blood vessels dilate to let more traffic into the area to help out

Fibroblasts repair the infrastructure

If possible, the cells who died will eventually divide and restore the population. If a nerve or a big part of a muscle fascicle died, nothing happens. 

Angiogenesis is initiated and new blood vessels grow into the damaged area to replace damaged ones. 

All of these are done via chemical signals released by cells in the location of the injry and the white blood cells.