血液由心脏泵出后,循环于周身,供给机体各种器官、组织及每个细胞新陈代谢所需要的营养和氧气,同时把机体不断产生的代谢产物运输到排泄器(如肾脏等)排出体外,从而保持机体的正常生命活动。众所周知,血液中的红细胞(俗称红血球)具有携带氧气的功能,而这种携带氧气的功能主要是由红细胞内的血红蛋白(铁是其不可缺少的主要原料之一)承包。 After the blood is pumped out of the heart, it is circulated throughout the body to supply nutrients and oxygen required for the metabolism of various organs, tissues and cells of each body and transport the metabolites continuously produced by the body to the excretory organs (such as the kidneys) Thus maintaining the body’s normal life activities. It is well-known that erythrocytes (commonly known as red blood cells) in the blood have the function of carrying oxygen, and this oxygen carrying function is mainly contracted by hemoglobin in red blood cells (iron is one of the indispensable main raw materials).