How is iron primarily excreted from the body? Iron is excreted through urine as a waste product. Iron is eliminated through sweating and skin shedding. Iron is not actively excreted; it is regulated through the absorption process in the intestines Iron is expelled from the body via bile in the liver.
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How does the body deal with a high intake of iron from food? a. By trapping iron in the intestinal cells b. By excreting excess iron through the urine c. By initiating an inflammatory reaction d. By storing excess iron in liver cells e. By maintaining the feeling of satiety
Adi S.
Iron absorption into mucosal cells of the gut is a simple diffusion process. Hemosiderin is produced by denaturation of ferritin with the loss of some apoprotein. Apotransferrin is a large protein complex capable of binding thousands of iron hydroxide molecules. Iron is transported in blood chiefly as part of ferritin. Oxidizing agents promote the absorption of iron from the intestine.
The body gains water by absorbing water from the slurry in the lumen of the small intestine and from condensation reactions. The mammalian body loses water mostly by excretion of urine, evaporation through the skin and sweating, elimination of feces from the gut, and as the body is cooled. Thirst behavior, in which the brain compels the individual to seek liquids, influences the gain of water. The body gains solutes by absorption of substances from the gut, by the secretion of hormones and other substances, and by metabolism, which produces carbon dioxide and other waste products of degradative reactions. Besides carbon dioxide, there are several other metabolic wastes that must be eliminated: urea, formed when amino groups are detached from amino acids; ammonia, which is produced in the liver during reactions that link two ammonia molecules to carbon dioxide and release a molecule of water, and uric acid, which is formed in reactions that break down nucleic acids.
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