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That is a very good question! You need oxygen for metabolic processes. Oxygen is very sparingly soluble in the water. Only 4 ml oxygen can be dissolved in one litre of plasma or water. So to transfer the oxygen in large amount, hemoglobin molecule is used. Each hemoglobin molecule can transfer four molecules of oxygen. So almost 70 times more oxygen is carried by blood, that is 280 ml per litre. The bonding is tight enough to hold the oxygen at high relative pressure and loose enough to give at low relative pressure of oxygen. On the contrary, 900 ml carbon bi oxide can be dissolved in one litre of water or plasma.

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11y ago

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