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不知道你在生活中有没有注意到，当你在吞咽东西的时候，是不能同事进行呼吸的，如果不信不放亲自测试下，那么，为什么人在吞咽的同时不能进行呼吸呢？咽是呼吸道和消化道的共同器官，鼻吸入的空气和经咀嚼的食物都会经过咽，之后空气会进入气管，食物则会进入食道，这是由咽喉下方的会厌软骨所决定的。当吸气时，会厌软骨静止不动，让空气进入气管；当吞咽时，一方面软颚会向后延伸，阻止食物进入鼻腔；另一方面喉的上升，令会厌软骨像门一样，将气管喉覆盖，令食物进入食道。由此可知，在吞咽那一刻，呼吸是暂停的，吞咽完毕，软颚、喉会厌软骨迅速恢复原位。如果同时进行，吞咽的东西就会到气管，接着到呼吸道里，会使人窒息死亡。但是，6个月以下的婴儿因为气管位置较高，食物不会“走岔道”，因此可以一边吸奶一边呼吸。
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