![]() ![]() ![]() Iron is also found bound to proteins (hemoprotein) and non-heme enzymes involved in oxidation-reduction reactions and the transfer of electrons (cytochromes and catalase). In the human body, iron exists mainly in erythrocytes as the heme compound hemoglobin (approximately 2 g of iron in men and 1.5 g in women), to a lesser extent in storage compounds (ferritin and hemosiderin) and in muscle cells as myoglobin. The mechanism of iron excretion is an unregulated process arrived at through loss in sweat, menstruation, shedding of hair and skin cells, and rapid turnover and excretion of enterocytes. Unlike other minerals, iron levels in the human body are controlled only by absorption. Iron is an essential element of various metabolic processes in humans, including DNA synthesis, electron transport, and oxygen transport. ![]()
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