Specifically, is there a hormone or some impulse that signals to the body, “hey we should make this stronger” whenever damaged/injured? Like is there a name for it?
Whenever exercising your body naturally builds endurance/strength in the applicable areas, and whenever injured such as a fractured wrist, it’s built back stronger. Or for instance, scars, while visually unattractive is meant to be stronger, more hardened skin/tissue.
Is it merely growth hormone?
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It’s not one specific hormone or impulse other than just the general series of impulses that tell your brain you are injured and you need more nutrients and blood flo to that area. When you have scars, it’s because collagen that is in your skin is released in those areas causing it to build up around the damaged tissue helping to strengthen and heal it. For muscle it’s just tearing the current muscle and rebuilding more muscle on top of it because your body is sending signals that you need more nutrients and blood flow there which will build up that muscle. Ya human growth hormone is in the mix but it’s just like 1 of 20+ events involved. Here is an article about the bio markers of the healing process – https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3495371/
This article may be easier to read: https://sitn.hms.harvard.edu/flash/2013/issue133a/
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