When blood reaches the respiring tissues, haemoglobin
- A. releases carbon dioxide and binds more oxygen
- B. is destroyed by the cells
- C. holds its oxygen more tightly
- D. releases oxygen and picks up carbon dioxide
Explanation
Low oxygen pressure and high CO2 in the tissues make haemoglobin surrender oxygen and take on CO2 and H+, reversing what happened in the lungs. One molecule thus shuttles both gases on the same round trip.
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