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SSS 2009-11-25

时间:2010-05-19 03:26来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

Maybe it’s happened to you. You think you have a fever. So you pop a thermometer in your mouth and try to breathe through your nose to get an accurate reading. But you’re totally stuffed up, so you experience this moment of complete panic because you can’t get enough air. Well, a new study in the journal Cell says you can thank your amygdala for that. Because this key member of the brain’s fear circuitry can directly sense suffocation1, and trigger feelings of terror.

The amygdala plays a role in responding to threats, and it can kick off a fight-or-flight reaction when it senses danger. Now, this brain region is packed with a type of protein that’s activated2 by acid, and seems to be involved in an animal’s response to fear. Well, suffocation is pretty scary and signals to the brain that something isn’t right. And it does so by activating3 this acid-sensing protein.

When an animal can’t breathe, carbon dioxide builds up, and boosts the amount of acid in the body. The acid, in turn, turns on this protein, which then hits the panic button and tells the animal to do something. Even if, during the Thanksgiving meal, it’s just to remind the animal to stop swallowing and take a deep breath.

 


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1 suffocation b834eadeaf680f6ffcb13068245a1fed     
n.窒息
参考例句:
  • The greatest dangers of pyroclastic avalanches are probably heat and suffocation. 火成碎屑崩落的最大危害可能是炽热和窒息作用。 来自辞典例句
  • The room was hot to suffocation. 房间热得闷人。 来自辞典例句
2 activated c3905c37f4127686d512a7665206852e     
adj. 激活的 动词activate的过去式和过去分词
参考例句:
  • The canister is filled with activated charcoal.蒸气回收罐中充满了活性炭。
3 activating 948eea612456562bf255d3a9c59c40a3     
活动的,活性的
参考例句:
  • "I didn't say we'd got to stop activating the masses! “我并没说就此不发动! 来自子夜部分
  • Presumably both the very small size and activating influence of fluorine atoms contribute to this exception. 这大概是由于氟原子半径小和活性高这两个原因的影响,氟原子对这种例外做出了贡献。
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TAG标签:   SSS  circuitry
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