Which statement regarding haemoglobin is correct? A) It combines preferentially with O₂ over any other molecules. B) When combined with carbon dioxide, it is known as oxyhaemoglobin. C) It plays a critical role in determining the amount of O₂ that is exchanged between alveoli and blood, because it acts as a storage depot, removing dissolved O₂ from the blood and thereby keeping PO₂ low and allowing net diffusion of O₂ to continue until the haemoglobin is completely saturated. D) It combines preferentially with CO₂ when partial partial pressure of O₂ is high in arterial blood.

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Haemoglobin acts as a storage depot for oxygen, binding to it and keeping the partial pressure of oxygen (PO2) low, which facilitates the continuous diffusion of oxygen from the alveoli into the blood until haemoglobin is saturated.

Which Statement Regarding Haemoglobin Is Correct