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Visitor 1548674464 posted an answer
10 months, 8 days ago

Hemoglobin is the protein present in blood responsible for the transport of oxygen from the lungs to tissues and cells.

The hemoglobin molecule is composed of four protein chains, each with a heme group containing an iron atom. The iron is responsible for the binding of oxygen in the lungs and also for the red color of hemoglobin and therefore blood.
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