Most of the oxygen in the blood is found in the _____.
A
Plasma
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B
Haemoglobin
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C
Iron
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D
Capillaries
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Solution
The correct option is B
Haemoglobin
Haemoglobin is present in the red blood cells in humans. Of all the oxygen carried by the blood, 2% remains dissolved in the blood plasma. About 98% of the oxygen is transported as bound to haemoglobin. Each molecule of haemoglobin can carry 4 molecules of oxygen at a time.