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心脏的功能是借助“泵”的作用,将血液从静脉抽吸至心脏,然后再射到动脉中,以供应机体的需要。在安静情况下,心脏的每分输出量为3.5—5.5立升(运动时可增加5—10倍),每昼夜的工作量约为15,000—20,000仟克米。一个活70岁的人,心跳按70次/分计算,总收缩次数高达26亿多次,如每次搏血量为60毫升,共搏血达1.5亿公升(约重16万吨),而总工作量为2.4亿仟克米。因此,心脏为完成如此巨大的工作量,本身必须有足够的血液供
The function of the heart is to pump blood from the vein to the heart and then into the artery to supply the body’s needs. In quiet situations, the heart’s output per minute is 3.5-5.5 liters (5-10 times increase during exercise) and the workload per day and night is about 15,000-20,000 kg. A 70-year-old person with a heartbeat at 70 beats / min has a total contracted as many as 2.6 billion times. For example, each stroke has a volume of 60 ml and a total of 150 million liters of blood (about 160,000 tons) The total workload of 240 million kg of rice. Therefore, to accomplish such a huge workload, the heart itself must have adequate blood supply