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Question

Which one of these gases is mostly transported by binding to haemoglobin?

A
Hydrogen
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B
Carbon sulphide
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C
Hydrogen sulphide
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D
Oxygen
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Solution

The correct option is D Oxygen
Most of oxygen is transported by binding to haemoglobin, while a little of carbon dioxide is transported by this method. Only 20-25% of carbon dioxide is transported by binding to haemoglobin, about 70% of it is transported as carbonate ions and around 3% by simple diffusion. Nitrogen and carbon monoxide are not normally transported by the blood.

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