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为什么长期在平原生活的人初次进藏,或登上4000米以上的高山时,就会感到头晕,心跳呼吸加快,甚至引起肺水肿、昏迷等高山反应呢?为什么在一些地区的人由于某些元素分布过多或过少而患上地方病呢?事实表明地理环境与人体健康有着非常密切的关系。青藏高原被誉为“世界屋脊”,海拔大部分超过4000米。随着地势的增高,空气变得稀薄,大气中的含氧量减少。在这种条件下,对于习惯居住于低海拔的人来讲,肺功能往往不能适应这种特殊环境,需要有几天或几周的适应期。而长期生活在高原地段的藏族同胞之所以
Why do people who live in the plains on a long-term basis experience dizziness, rapid heartbeat, and even alpine reactions such as pulmonary edema and coma when they first go to Tibet or climb the mountains above 4,000 meters? Why do some people in some areas, because of certain Elemental distribution is too much or too little and suffer from endemic? Facts show that the geographical environment and human health have a very close relationship. Qinghai-Tibet Plateau known as “the roof of the world,” most of the more than 4,000 meters above sea level. As the terrain increases, the air becomes thinner and the amount of oxygen in the atmosphere decreases. Under these conditions, lung function is often not adapted to this particular environment for people habitually living at low elevations, requiring a few days or weeks of conditioning. The reason for the Tibetan compatriots living in the plateau for a long time