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血液是一种红色的液体,充满于心血管系统之中,在心脏搏动产生压力的推动下沿着动脉→毛细血管→静脉流动,最后又回到心脏。血液昼夜不停地循环,为人体各个组织器官输送营养物质和氧气,同时将全身各组织在生命活动中产生的各种废物和二氧化碳运到肺和肾脏,通过呼气、尿液等排泄出去。形容血液是人体的生命之河,真是再恰当不过。 人究竟有多少血液呢?专家告诉我们,它的总量约占体重的8％,也就是说,每公斤体重有血液80毫升。
Blood is a red liquid filled in the cardiovascular system, moving along the artery → capillaries → veins, under the impetus of heart beating and eventually back to the heart. Circulating around the clock, the blood circulates nutrients and oxygen to various tissues and organs of the human body. At the same time, various kinds of wastes and carbon dioxide generated from life activities of various tissues and tissues are transported to the lungs and kidneys, excreted through exhalation, urine and the like. Describe the blood is the river of life, it is quite appropriate. How much blood people have? Experts tell us that it accounts for about 8% of the total weight, that is, 80 ml of blood per kilogram of body weight.