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When you hold your breath your brain sends a message to the diaphragm and rib muscles telling them to breathe . why is this?
Wiki User
∙ 8y ago
The brain uses a CO2 - O2 feedback system. CO2 rises as O2 is depleted. The brain receives signals of rising CO2, and triggers the diaphragm.
Incidentally, this system becomes reversed in emphysema and severe lung conditions. The brain becomes accustomed to rising CO2. IF too much O2 is administered externally, it will stop the brain from signalling the next breath. So while a person with healthy lungs can tolerate external O2 at 8 liters per minute, people with emphysema can only tolerate no more than 2 liters per minute---or the person will stop breathing.
Wiki User
∙ 8y ago
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