在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 資源技巧 » 正文

為什么我們的身體會發麻?

放大字體  縮小字體 發布日期:2007-12-18
核心提示:保持一個姿勢久了,身體就會有發麻的感覺。當你改變姿勢的時候,會感到非常的難受:刺痛、痙攣,然后是慢慢恢復知覺。這種發麻的滋味還真不好受。那么,為什么我們的身體會發麻呢?看了下面這篇文章你就會有所了解了。 The unnerving, separate sensations we feel whe


    保持一個姿勢久了,身體就會有發麻的感覺。當你改變姿勢的時候,會感到非常的難受:刺痛、痙攣,然后是慢慢恢復知覺。這種發麻的滋味還真不好受。那么,為什么我們的身體會發麻呢?看了下面這篇文章你就會有所了解了。 

    The unnerving, separate sensations we feel when a body part "falls asleep" truly result from nerves under pressure. 

    Scientists, using the arm as an example of a limb that has fallen asleep, explain that the person, most likely, slept on the arm. This sleeping position exerted pressure on the nerves, which squeezed them and, thus, inhibited the messages the nerves carry to the brain and to the rest of the body. If sleeping on the arm also squeezed the blood vessels, oxygen normally carried to the nerves by these vessels never made it to its destination. 

    The nerves themselves comprise bundles of single celled fibers, with each fiber conveying a different sensation or message to the brain. The fibers vary in thickness and in the amounts of myelin, a protective sheath, surrounding them. These two variables determine the sensitivity of the nerve fiber to pressure and to oxygen deprivation. As a general rule, the thicker the fiber, and the larger the myelin sheath, the more sensitive it is. 
    When one removes the pressure on the nerves and on the blood vessels, in this case by a change in sleeping position, the nerve fibers awaken in order of their thickness and of the thickness of their myelin sheaths. Hence, the thickest and most protected ones awaken last. This gradual awakening process causes the different sensations we experience as the affected body part returns to its functional state. 

    The first sensation we experience is a tingling sensation, followed by a burning sensation, as the fibers that control pain and temperature now function and are again able to transmit these messages to the brain. Not until later, does the numbness we feel disappear, simply because the fibers that control touch and position are thicker fibers with thicker myelin sheaths. Similar fibers, known as motor neurons, travel in the same nerves, but take direct orders from the brain to the spinal cord to the muscles, and awaken shortly after those controlling touch and position. For this reason, after the numbness disappears, we regain our ability to move the affected body part, and life is finally backed to normal. 

    unnerving: 身心疲憊 

    myelin: 髓磷脂

    tingling: 刺痛

 

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關鍵詞: 我們 身體 發麻
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 3.111 second(s), 532 queries, Memory 2.55 M
主站蜘蛛池模板: 好吊色7777sao在线视频观看 | 四虎地址8848最新章节 | 99热久久精品最新 | 日本黄色大片免费观看 | 深夜视频在线播放视频在线观看免费观看 | 狠狠干一区 | 五月激情在线 | 国产乱淫a∨片免费视频 | 国产女人和拘做受视频免费 | 婷婷综合激情 | 欧美性一区二区三区 | 性欧美视频 | 国产人成午夜免费噼啪视频 | 欧美456| 亚洲成人7777 | 欧美在线激情 | 视频在线观看一区 | 午夜美女久久久久爽久久 | 国产激烈床戏无遮挡在线观看 | 97午夜精品 | 欧美乱理伦另类视频 | 国内黄色一级片 | 黄色在线网站视频 | 免费看特级淫片日本 | 国语自产自拍秒拍在线视频 | 222aaa免费国产在线观看 | 噜噜噜天天躁狠狠躁夜夜精品 | 久久精品国产福利 | 国产女在线 | 国产精品三级在线播放 | 午夜爽视频 | 一区二区三区视频在线 | 91精品啪国产在线观看免费牛牛 | 国产美女精品久久久久中文 | 五月婷婷深深爱 | 72种姿势欧美久久久久大黄蕉 | 天天做天天爱天天干 | 俺去啦最新官网 | 久久精品乱子伦免费 | 岬奈奈美在线 国产一区 | 欧美性爽xxxⅹbbbb |