Answer:The main role of iron in the body is in the red blood cells where it helps carry oxygen to the body's cells and tissues. In the red blood cells, iron combines with a protein called haemoglobin. ... Iron is also important for our immune systems (to fight disease), brain function and muscle strength. Your body is composed of about 60% water. The functions of these bodily fluids include digestion, absorption, circulation, creation of saliva, transportation of nutrients, and maintenance of body temperature.
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