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Oxygen is mainly transported in blood by which substance?

Answer and explanation

Correct answer: Haemoglobin

Haemoglobin is a protein present in red blood cells. It binds oxygen in the lungs to form oxyhaemoglobin and carries it to body tissues. Only a very small amount of oxygen is dissolved in blood plasma, so plasma is not the main carrier. Exam tip: Remember that oxygen is mainly carried by haemoglobin, whereas most carbon dioxide is transported as bicarbonate ions.

Related tags

HaemoglobinOxygen TransportRed Blood CellsBlood PlasmaHuman CirculationLife ProcessesTransportationScience

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