搜狐首页 - 新闻 - 体育 - 娱乐 - 财经 - IT - 汽车 - 房产 - 女人 - 短信 - 彩信 - 校友录 - 邮件 - 搜索 - BBS - 搜狗 
Sohu >> English home >> Language Tips >> Culture Bites
人为什么会打哈欠?
(China Daily) Updated:2005-07-06 13:37
人为什么会打哈欠?
 

  Why do we yawn?

  The truth is that we don't completely understand why people, or animals for that matter, yawn.

  It's widely assumed that yawning occurs because we are tired or bored or because we see someone else doing it, but there isn't any hard evidence to support these beliefs.

  Scientists do not purport to know all of the biological mechanisms of the yawn, but tend to agree that a yawn is an involuntary respiratory reflex, which regulates the carbon dioxide and oxygen levels in the blood.

  Technically, a yawn is the reflex opening of the mouth followed by the deep inhalation and slow exhalation of oxygen.

  The very act of yawning is but one of a number of involuntary reflexes controlled by the spinal and nerve centers.

  Scientists speculate that the onset of a yawn is triggered either by fatigue, or by sheer boredom as, at those times, breathing is shallow, and little oxygen is carried to the lungs by the oxygen-toting cardiovascular system.

  When one yawns, his or her alertness is heightened, as the sudden intake of oxygen increases the heart rate, rids the lungs and the bloodstream of the carbon dioxide buildup, and forces oxygen through blood vessels in the brain, while restoring normal breathing and ventilating the lungs.

  This quite plausible theory of yawning falls short of explaining many aspects of yawning. Scientists explain away the "contagious" nature of yawning, that is when one person's yawn triggers another nearby to yawn, as due to the power of suggestion, but are at a loss when attempting to explain why yawning occurs excessively in patients with lower brainstem damage or with multiple sclerosis.

  Other unlocked mysteries include why fetuses in the womb yawn, when it is a well-known fact that they do not intake oxygen into their lungs until after live birth, or why individuals with high concentrations of oxygen in their blood streams yawn.

  Until these questions are answered, do not assume that a person who yawns in your presence is bored with what you are saying, or suffers from exhaustion. Simply be pleased that he or she is not bored to death.

  note:

  purport: 声称

  involuntary: 不知不觉的

  respiratory reflex: 呼吸反射

  inhalation: 吸入

  exhalation: 呼出

  spinal: 脊椎的

  cardiovascular system: 心血管系统

  falls short of: 不足以,达不到

  at a loss: 困惑的

  brainstem: 脑干

  sclerosis: 硬化症

  fetus: 胎儿

  womb: 子宫

搜狗(www.sogou.com)搜索:“oxygen”,共找到 8,125 个相关网页.
Comment This | Font Size  Large     Medium    Small | Print This | Close
Related Stories
  • 为什么会有卷发与直发之分?(07/04 13:34)
  • 为什么雪是白色的?(07/01 13:55)
  • 头发为何会变灰?(06/29 13:53)
  • 如何称呼午夜12点?(06/27 13:47)
  • 为什么转圈时会头晕?(06/24 13:34)
  • 细菌是什么?(06/22 13:50)
  • 狗能看见颜色吗?(06/20 13:40)
  • 何谓太阳黑子?(06/17 14:02)
  • 我们为什么会流泪?(06/15 13:47)


  • ChinaRen - 搜狐招聘 - 网站登录 - 帮助中心 - 设置首页 - 广告服务 - 联系方式 - 保护隐私权 - About SOHU - 公司介绍
    Copyright © 2005 Sohu.com Inc. All rights reserved. 搜狐公司 版权所有