What happens if you hold your breath till you pass out?

Holding your breathe will cause your blood CO2 (carbon dioxide) to rise and you will begin breathing again.

When you hold your breath you don’t let any oxygen in and carbon dioxide out when your lungs stop producing carbon dioxide and stop in taking oxygen no oxygen will get to your brain, this is the point where you pass out. After you pass out depending on your lung health you will either start breathing again and be fine or completely stop breathing and at that point it is very dangerous.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.