IRON
Iron is a lustrous, ductile, malleable, silver-gray metal whose atomic no. is 26 (group VIII of the periodic table). It is known to exist in four distinct crystalline forms. Iron rusts in dump air, but not in dry air. It dissolves readily in dilute acids. It is one of the most abundant metals on Earth, is essential to most life forms and to normal human physiology. Iron is an integral part of many proteins and enzymes that maintain good health. In humans, iron is an essential component of proteins involved in oxygen transport . It is also essential for the regulation of cell growth and differentiation . A deficiency of iron limits oxygen delivery to cells, resulting in fatigue, poor work performance, and decreased immunity . On the other hand, excess amounts of iron can result in toxicity and even death . Almost two-thirds of iron in the body is found in hemoglobin, the protein in red blood cells that carries oxygen to tissues. Smaller amounts of iron are found in myogl...