铁在人体内有多种功能 ,但其主要方面是以血红蛋白形式起作用 ,将氧从肺运输到各个需要氧的组织。循环血红蛋白浓度降低与氧运输能力减少和运动功能下降有关。机体以铁蛋白形式贮存铁 ,而在各组织运输铁是靠另一种蛋白 (铁传递蛋白 )来完成的。铁缺乏的第一个迹象一般是循环铁 Iron has multiple functions in the human body, but its major aspect is the action of hemoglobin, which transports oxygen from the lungs to various tissues that require oxygen. Decreased circulating hemoglobin concentration is associated with reduced oxygen transport capacity and decreased motor function. The body stores iron in the form of ferritin, and in each tissue the iron is transported by another protein (transferrin). The first sign of iron deficiency is usually circular iron