How does the hole in a Hollow's chest work? In Bleach, Hollows (and Espadas) have holes in their chest. However, the holes do not bleed and seem to have no harmful effects on the body. For human-shaped Hollows and Espada, do the organs rearrange themselves around the holes or just cease to exist where the holes are? Also, how do the holes not bleed? Does skin grow around inside the holes or are the cauterized?
Hollows are not like normal living creatures. Don't forget that they are born from human souls, not from flesh and bones. In chapter 433 it is explained that 


   Hollows lose their hearts from the pain of not being saved by shinigami. That forms the hole. Their lost hearts form their masks. Also, the hollows' unique appearance and their unique traits and powers are formed from their lost hearts as well. 


Also, don't forget what happens when they are killed. Their bodies simply vanish, leaving no corpse, no anything. So, taking that into account, we can say that


   since they can live with their heart lost, their bodies (even if we forget that Hollows are spirit creatures) definitely don't work the same way as human (or shinigami) bodies do, so they somehow are able to live with it.


And I guess that since they are spirit creatures they don't care about such things anyway ;)