Your body maintains homeostasis when you fall by responding to the type of pain you experience from the fall.
Pain presents an fascinating demand on the body and many factors can influence the brain to send a pain signal, in response to a perceived threat, in order to let your body know that something is wrong.
Another outcome of pain and injury is simply that your body will try its hardest to adapt to the stress of that specific injury.
Hope this helped answer your question! Let me know if it didn't make sense. :-)