What is the reason for the need for iron ions to enter the human blood?

Iron ions are essential for human life.

1) Iron is a constituent of hemoglobin, of which red blood cells are composed. It is it that is responsible for the capture of oxygen, and the blood cells carry it to all systems of the body.

2) Also, iron is an integral part of many enzymes and proteins that are necessary for metabolism – the conversion of calories into energy, and other metabolic processes.

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