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为了帮助大家备考托福阅读，提高成绩，下面小编给大家带来托福阅读TPO24(试题+答案+译文)第2篇:Breathing During Sleep，希望大家喜欢!

托福阅读原文

【1】Of all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function. Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. However, there are many other changes that affect respiration when asleep.

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