Haemoglobin mainly transports which of the following gases?

Hydrogen

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Nitrogen

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Hydrogen sulphide

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Oxygen

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Solution

The correct option is D
Oxygen

In the body, most of the oxygen is transported by binding to haemoglobin. 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.

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