英语听力文摘 English Digest 641 什么引起你嗓子哽咽？

 　　What Causes A Lump In Your Throat?

　　Oftentimes when we cry, we feel a lump in the throat. Does a lump actually form, or is there some other explanation?

图片1

　　Explanation

　　The lump-like thing we feel when overcome by emotion has to do with how the nervous system deals with stress. The part of the nervous system that handles stress is called the autonomic nervous system. It controls bodily functions that we do not consciously control, such as digesting food and pumping blood through the heart. However, the autonomic nervous system is also important in dealing¹ with emotional states.

　　When an animal encounters a stressful situation, its autonomic nervous system kicks in to allow it to either fight or run away. It does this by increasing the flow of blood and oxygen to the necessary muscles. The same applies to humans. Even when we experience emotions such as grief or sorrow, the autonomic nervous system responds as it would to anger or fear by increasing the flow of oxygen through the body.

　　Oxygen Intake²

　　To increase oxygen intake, the autonomic nervous system makes us breath faster, and expands the glottis, the opening in the throat that allows air to flow from the larynx to the lungs. The expansion of the glottis in and of itself does not create a lumpy feeling, until we try to swallow. Since swallowing involves closing the glottis, this works against the muscles that open the glottis in response to crying. We experience the resulting muscle tension as a lump in the throat.

1 dealing   

n.经商方法，待人态度

参考例句：

• This store has an excellent reputation for fair dealing.该商店因买卖公道而享有极高的声誉。
• His fair dealing earned our confidence.他的诚实的行为获得我们的信任。

2 intake   

n.吸入，纳入；进气口，入口

参考例句：

• Reduce your salt intake.减少盐的摄入量。
• There was a horrified intake of breath from every child.所有的孩子都害怕地倒抽了一口凉气。