Biology / Bio 3169 · Atom · ~20 seconds
"Breathing Is Driven by Low Oxygen"
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Assuming falling oxygen is what triggers each breath overstates a real signal — the primary drive instead tracks rising carbon dioxide and falling pH, per Bio 3165's own gradient.
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Holding one's breath becomes urgent from rising carbon dioxide discomfort well before oxygen levels drop critically low.
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This entry states the popular assumption — Bio 3171 gives the chemoreceptor mechanism this misconception overlooks.