在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

您現在的位置: Language Tips> Easy English> Odd Question  
 





 
為什么轉圈時會頭暈
[ 2007-06-15 14:04 ]

還記得小時候坐轉椅的感覺嗎?轉一圈下來后,頭暈暈的。或者當我們蹲下猛地站起的時候,也容易感到頭暈眼花。這是為什么呢?有些人把這種現象歸結為血壓低,但事實上也許并不是這么回事。

Rolling down a hill or spinning around in endless circles causes dizziness orvertigobecause hair-likesensory nervecells in our ears send wrong messages to our brain.

The motions of our bodies are detected by thevestibular systemfound in the upper part of our inner ear. The vestibular system senses whether we are standing up or lying down.

When we spin in circles or get up too fast from the couch, we feel dizzy andlightheadeddue to the vestibular system's nerve reactions to these unusual motions.

Here's how our vestibular system reacts to a slight change in direction when we bend our heads: The vestibular system senses motion through three semicircular canals that are at right angles to one another. Not only do these canals have hair-like sensory nerve cells, but they also contain afluidcalledendolymph.

Following the principle ofinertia, endolymph resists changes in motion. As a result of this resistance, the endolymph lags behind and stimulates hair cells to send nerve signals to the brain. Our brain interprets the nerve messages and knows which direction the head moved.

However, when we spin, our brain receives mixed messages. The endolymph slowly begins to move in the same direction we are spinning. As time goes by, the endolymph catches up to the rate of speed we are spinning and no longer stimulates the hair-like nerve cells. This causes our brain to quickly adapt to the nerve signals. However, when we stop spinning, the endolymph continues to move and stimulates hair cells in the opposite direction.

These hair cells send wrong messages to the brain making it think that the head is still spinning although it actually has stopped. As a result of this inaccurate signal, we experience dizziness. Eventually, the endolymph stops moving and no more signals are sent to the brain. The brain interprets that the spinning motion has ceased and the dizziness disappears.

vertigo: 暈頭轉向
sensory nerve: 感覺神經
vestibular system: 前庭系統
lightheaded: 頭昏眼花的
fluid: 液體
endolymph: 內淋巴
inertia: 慣性

(來源:coolquiz.com 英語點津 Annabel 編輯)

我想了解更多趣味百科知識

 
 
相關文章 Related Stories
 
電子郵件地址中的@是怎么來的? 文胸的起源 紅豆為什么又叫“相思豆”?
為什么我們的腳會臭 比薩餅是怎么發明的 為什么自己癢自己沒感覺?
         
 
 
 
 
 
         
 
 

48小時內最熱門

     
  女孩的心思誰能猜:Suspended from class
  各種各樣的“錢”
  “搶鏡頭”怎么說
  姚明婚后打算:備戰奧運第一

本頻道最新推薦

     
  為什么畢業時要穿學位服
  We cats can use chopsticks, too!
  不受歡迎的夜半歌聲:打鼾
  US Independence Day(美國國慶日)
  Exercise after dinner

論壇熱貼

     
  “低生育,素質好,男女都是寶”,怎么譯為好?請教高手!
  請問“老鄉”這個詞怎么翻譯?
  C-E: how to say "路盲"?
  各位,“相親”英語怎么說?
  指紋上的ridges and loops是什么意思?
  請教一下 餃子的“餡” 用English怎么說啊






主站蜘蛛池模板: 国产精品www| 欧美日韩久久 | 国产精品久久久久久久久免费 | 国产精品欧美一区二区三区 | 国产亚洲欧美在线 | 日本三级黄色大片 | 欧美14一18处毛片 | 中文字幕不卡 | 中文字幕av第一页 | 色噜噜噜噜 | 天堂一区二区三区 | 久久99精品久久久久 | 午夜精选视频 | 久久午夜视频 | 黄色一级毛片免费 | 一区二区福利 | 国产一区精品在线 | 亚洲精品成人av | 欧美一区二区三区四区视频 | 成人1区2区 | 日韩素人在线 | 国产欧美日韩在线 | 国产在线播放av | 日韩久久一区二区 | 中文字幕日韩久久 | 国产日韩欧美视频 | 可以在线观看的黄色 | 99精品免费视频 | 在线视频91| 亚洲精品一区二区三区蜜桃久 | 久色视频在线观看 | 青春草在线观看 | 久久999| 一级片在线观看 | www.78av| 久久久中文字幕 | 日韩午夜影院 | 欧美日韩国产精品一区二区亚洲 | 岛国av免费观看 | www.伊人网| 欧美a区 |