This is because of your autonomic nervous system.. you can hold your
breath but when you hold it so long that you pass out, your brain will
tell your Autonomic Nervous system to make you breath.
You can't hold your breath forever because after your brain is oxygen
deprived for a time you will pass out. When you pass out you will begin
to breathe again (assuming there is nothing preventing it) because
breathing is an involuntary. That is why when children threaten their mother's with "holding my
breath until I die", it's best just to let them try... (Most of them
won't make it to the "pass-out" stage anyway.)
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