Exactly, blood flowing is very important. Biology is a slow process, and it only deal with long term mechanisms. Tissues can't deal with intensive tasks very w

Exactly, blood flowing is very important. Biology is a slow process, and it only deal with long term mechanisms. Tissues can't deal with intensive tasks very well. They can, of course, but I'll always think of death as a progressive slow down of activity. Biology works best when it's being used at a minimum. "Use it or lose it" has some kind of truth.