人类长有四个鼻孔 两个是你看不见的
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人类长有四个鼻孔 两个是你看不见的
人有几个鼻孔?
两个?四个?六个?
是四个。两个你能看见,两个你看不见。
这一发现来自对鱼类呼吸的观察。鱼类从水中获得氧气。它们大多数都有两对鼻孔,朝前的一对进水,后面的一对排水。问题是,假如人类是由鱼类进化而来的,那么另一对鼻孔到哪里去了呢?
答案是:人类这对鼻孔已经退化到了脑袋的内部,被称为“后鼻孔”,希腊语叫做“漏斗”。这对鼻孔与喉咙连接,可以使我们通过鼻子来呼吸。
为了做到这一点,这对“后鼻孔”必须要穿过牙齿向后移动。这听起来似乎不可思议,但是最近中国和瑞典的科学家发现,“原始肉鳍鱼肯氏鱼”(来自中国的距今3.95亿年前的鱼)的这种呼吸功能已经进化了一半。这种鱼类的前牙之间有两个类似于鼻孔的洞孔。
这种鱼类是陆地动物的原始祖先,它既能在空气中呼吸,也能在水中呼吸。它的一对鼻孔可以使其栖息在浅水中觅食,而另一对鼻孔就像鳄鱼那样露在水面之上。
在人类胎儿早期的牙齿中间也能看到类似的豁口。如果豁口连接不上,就变成了腭裂。看来,一个古老的鱼类化石解释了这个谜。
顺便说一下,关于鼻孔的最新研究结果表明,我们可以用两个外部鼻孔来探测不同的味道,还能根据吸进空气的多少来创造出一种立体声的鼻音。
摘自《太原日报》
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