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房子是由砖石砌成的,构成人体的“砖石”是细胞。人体内的每一个细胞都是一个独立的小生命。因为每一个细胞都有新陈代谢、繁殖后代、遗传变异等特性。一个成年人,大约由60万亿个细胞构成。换言之,一个生命之中寓有60万亿个小生命,这个数字约为全世界人口的15000倍!心脏是血液循环的原动力,是使血液流动的水泵。心脏每收缩一次,左右心室就各排出60毫升血,这就是说,一分钟从心脏要喷出5000毫升左右血。在剧烈运动时,一分钟甚至要喷出50000多毫升血液。正常成年人在安静状态下,心脏一天中跳动103680次左右,呼吸23040多次,每昼夜泵出的血量约6000
The house is made of masonry and the “masonry” of the human body is the cell. Every cell in the body is an independent little life. Because each cell has metabolism, breeding offspring, genetic variation and other characteristics. An adult, about 60 trillion cells. In other words, there are 60 trillion small lives in a single life, which is about 15,000 times larger than the world’s population! The heart is the driving force for blood circulation and the pump for blood to flow. Each contraction of the heart, the left and right ventricular discharge of 60 ml of blood, that is to say, a minute from the heart to spit out about 5000 ml of blood. In strenuous exercise, even a minute more than 50,000 ml of blood should be sprayed. Normal adults in a quiet state, the heart beats about 103680 times a day, breathing more than 23040 times a day pumping blood about 6000