In pranayama, we observe that carbon dioxide is not merely a waste but a vital signal for breath, carried as bicarbonate and bound to hemoglobin. Yet the percentages from textbooks—70% as bicarbonate, 20-23% bound to protein, 7-10% dissolved—feel too rigid. In deep kumbhaka, the balance shifts within; the blood whispers a different ratio when the mind is still. My own practice shows me CO₂ is not just carried, but converses with the prana.
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