Biology / Bio 3171 · Atom · ~20 seconds
Rising CO2 and Falling pH Drive the Breathing Reflex
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Central chemoreceptors detect rising carbon dioxide and falling pH in cerebrospinal fluid, per Bio 3167, and signal the brainstem to raise breathing rate before oxygen drops critically.
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A rebreathing bag raises inhaled carbon dioxide and quickly drives faster breathing despite ample oxygen.
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"Breathing is driven by low oxygen," per Bio 3169, ignores that oxygen sensors serve only as backup.
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