国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

您現(xiàn)在的位置: Language Tips> Easy English> Odd Question  
 





 
指甲是怎么生長的
[ 2007-07-20 13:47 ]

指甲是塑造美女必不可少的一部分。想要擁有美麗的指甲,先得來了解指甲的生長原理。

Fingernails and toenails grow from a point near the roots below the skin, at the base of the nail where the nail is very thin. White in color, and half-moon in shape, this semi-circle is appropriately named the "lunula, " and comprises a group of cells that manufacturekeratin, a dead, hoof-like protein. The keratin like protein produced, gathers and merges with the nail plate, the dead armor that protects the soft and tender nail bed underneath, and pushes the entire nail up and out. Though the fingernails and toenails grow an average of two inches per year, their growth slows with age, and the average adult's fingernails grow only one inch over the course of eight months.

The base of the fingernails and toenails, as well as some of the nail along both sides of the nail, are embedded into the skin. Unlike other skin, this skin contains elastic fibers that connect it to the fingernail or toenail, and hold it firmly in place. Thecuticle, a rim of skin over the lunula, protects it from bacterial infection, serves as a shock absorber, and shields the nail from any sudden impacts.

Though many consider dressing the fingernails up to go out a statement of beauty, or one of vanity, they serve those in the medical field as a diagnostic tool. Normally, the lunula, or half-moon, is white in color, indicating proper nutrition and good overall health. Blue lunula raise red flags that circulatory problems to the fingers may exist. Nails that are hard,brittle, and tend to split easily, may also be clues to poor circulation, infection, or disturbances of theglandularand nutritional systems.


Further nails that curl sharply around the finger point tocoronary, liver, or lung diseases. Nails that are sunken in appearance often indicateanemia, a condition where an insufficient amount of oxygen is carried by the blood.

lunula: 指甲下端的白色弧影,甲弧影
keratin: 角蛋白,角質(zhì)
cuticle: 角質(zhì)層
brittle: 硬而脆的
glandular: 腺的
coronary: 冠狀動脈
anemia: 貧血癥

(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(guān)文章 Related Stories
 
 
 

本頻道最新推薦

     
  為什么下雪時天氣暖
  You are the smartest fish I've ever seen!
  Dog burger
  為什么老了脾氣好
  飛蛾為什么撲火

論壇熱貼

     
  開個題目大家扯:hotel & restaurant
  追求某人
  請教工商年檢如何翻譯
  How to translate “中國老字號”into English?
  "港股直通車"怎么翻譯?
  兩免一補怎么說?




九台市| 江川县| 杭锦旗| 兰溪市| 浙江省| 东丰县| 正定县| 墨竹工卡县| 抚顺市| 宁夏| 丘北县| 丰都县| 中牟县| 丰镇市| 昌都县| 芦溪县| 读书| 双流县| 武川县| 揭阳市| 康平县| 长寿区| 高平市| 东安县| 邮箱| 内乡县| 荃湾区| 广德县| 凤翔县| 台前县| 商洛市| 霍林郭勒市| 察隅县| 镶黄旗| 垦利县| 宁陕县| 秦皇岛市| 玉林市| 德令哈市| 福清市| 宣恩县|