Hemoglobin A) combines preferentially with O₂ over any other substance. B) when combined with carbon dioxide is known as carboxyhemoglobin. C) 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 thereby keeping PO₂ low and allowing net diffusion of O₂ to continue until the hemoglobin is completely saturated. D) both (a) and (b) above. E) all of these answers

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The Answer of Hemoglobin A) combines preferentially with O₂ over any other substance. B) when combined with carbon dioxide is known as carboxyhemoglobin. C) 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 thereby keeping PO₂ low and allowing net diffusion of O₂ to continue until the hemoglobin is completely saturated. D) both (a) and (b) above. E) all of these answers