Which one of the following substances in the blood in man imparts the oxygen carrying capacity to it?

Haemocyanin

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Haemoglobin

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Haemoerythrin

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Sodium ions

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Solution

The correct option is C Haemoglobin
Haemocyanin is blue, copper-containing respiratory pigment occurring in the blood of molluscs and arthropods.
Haemoglobin is the iron-containing, oxygen-transport metalloprotein.
Haemoerythrin is an oligomeric protein responsible for oxygen transport in the marine invertebrate.
Thus, the correct answer is option (B), 'Haemoglobin'.

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