Why can't you kill yourself by holding your breath?

Answers:    Your body won't let you. After a certain amount of time (or a certain amount of carbon dioxide uilds up in your system) your body makes you breathe.
because breathing is an involuntary reflex
the reason u cant kill urself by holding ur breath is because if u hold ur breath for a certain amount of time u will pass out and ur body will automatically start breathing again
Because holding your breath is a conscious act. If you hold your breath long enough, you pass out, therefore losing consciousness. You then resume breathing normally, because that is what your subconscious is programmed to do

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