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人类能够适应对健康充满威胁的世界,并度过漫长的岁月,其重要原因之一在于人体具有很大的潜力.就人体的心脏来说,正常人在安静情况下,每分钟心脏输出的量约五千毫升;而在剧烈运动的情况下,心跳增快,每分钟可输出血液两万毫升以上;一个锻炼有素的运动员,一分钟输出的血液可达三万五千毫升.这说明,心脏的潜力很大,血液输出量的低和高限竟可相差二十三倍以上.再就人体的肺来说,人体的肺分左右两部分,共有五叶(左肺
One of the important reasons why human beings can adapt to a world threatening to health and spend a long time is that the human body has great potential. In the heart of a human being, in normal circumstances, the amount of cardiac output per minute About five thousand milliliters; and in the case of strenuous exercise, the heartbeat is faster, more than twenty thousand milliliters of blood can be output per minute; a well-trained athlete can output thirty-five milliliters of blood a minute, The great potential of the heart, the blood output and the high and low limits can be more than twenty-three times more.Then the human lungs, the human lung about two parts, a total of five leaves (left lung