国产av不卡一区二区_欧美xxxx做受欧美_成年人看的毛片_亚洲第一天堂在线观看_亚洲午夜精品久久久中文影院av_8x8ⅹ国产精品一区二区二区_久久精品国产sm调教网站演员_亚洲av综合色区无码一二三区_成人免费激情视频_国产九九九视频

 
 
 

Millions of Americans Suffer From Hair Loss

2013-05-07 11:24

 

Get Flash Player

Download

This is Science in the News, in VOA Special English. I'm Shirley Griffith.

And I'm June Simms. Today we talk about hair. We will tell what hair is, how it grows, and some of the main reasons people lose it.

Hair has always been an important sign of beauty. This is especially true for women. Next to the face, hair is one of the main qualities people look for when they consider a woman's beauty. Whether long or short, curly or straight, hair often gets a lot of attention.

Each hair on a person's head grows from a single tube-like hole in the skin called a follicle. People are born with all of the hair follicles they are ever going to have. The average person has about one hundred thousand hair follicles. They begin to form on a fetus around the third month of pregnancy.

The part of the hair under the skin is known as the hair root. The hair sticking out from the skin is known as the hair shaft. The shaft is made up of dead cells that have been pushed up through the root. At the base of the hair root is a small ball-like formation called a bulb. This is where new cells are formed. These cells receive nutrition from the blood supply under the skin.

As new cells form, the older cells are pushed up through the root. In time, the old cells are cut off from the blood supply and begin to form a hard protein called keratin. Keratin is the same protein found in our skin and nails. These dead cells and keratin are what make up the hair shaft. This whole process is what causes hair to grow.

Each hair grows independently of other hairs. There are three periods of hair growth. Not all hairs experience the same period of growth at the same time. The period of active growth is called Anagen. During this period, hair grows at a rate of about three tenths millimeters a day, or one centimeter a month. About 85 percent of hair follicles are going through this process at any given time. This period can last from two to six years.

The Catagen period of hair growth comes next. It is then that hair growth begins to slow down. This period usually lasts two or three weeks. Finally, hair growth comes to a complete stop and the hairs begin to fall out. This period is known as Telogen. It affects about 15 percent of all hairs at a time.

On average, a person loses between 50 and 100 hairs every day. Since each hair grows at a different rate, this process is overlooked. Once the Telogen period has ended, the hair growth process begins again.

So what happens when a person has trouble growing hair or suffers from hair loss? Your genes control how fast or how long your hair will grow. Some people have a longer than usual anagen growth period. These people may be able to grow more hair than the average person. However, others struggle to grow shoulder length hair. These people have a shorter than normal anagen period.

Your health can also affect hair growth. Poor nutrition can cause some hair follicles to stop growing or cause the hairs that grow to become weak or thin. Problems with hair growth can result from thyroid problems or other conditions like anemia, diabetes and lupus. Health experts say people who experience a sudden increase in hair loss should seek medical advice.

Some hair loss can result from a combination of genetics, aging and hormones. When this happens, the hair growth cycle changes and the hair follicles get smaller. In addition, the hairs may get thinner and shorter. Soon the hairs stop growing completely on some parts of the head. People with this condition usually have family members who have experienced similar hair losses. This kind of hair loss is known as pattern baldness. It is the most common kind of hair loss. The official medical term for the condition is androgenetic alopecia.

The Latin word alopecia means loss of hair or baldness. It is also the term used to describe the medical condition that results in the loss of hair. Alopecia areata is the second most common form of hair loss after pattern baldness. It is the most common form of autoimmune disease. In alopecia areata, the body's defenses against disease attack the hair follicles, resulting in a loss of hair on the scalp and other parts of the body.

The condition usually begins with small round areas of hair loss on the scalp. When hair loss takes place over the whole surface of the scalp, it is called alopecia areata totalis. Sometimes a person may lose their eyebrows, eyelashes or hair on other parts of the body. This condition is called alopecia areata universalis. It is the rarest form of alopecia.

The National Alopecia Areata Foundation says alopecia areata affects about two percent of the population. About five million people in the United States have the condition. It affects people of all ages and races, and often begins in childhood.

That was true of Kayla Martell, the winner of the Miss Delaware Pageant in 2010. Ms. Martell began losing her hair when she was about 10 years old. By the time she was 13, all of her hair had come out.

Kayla Martell began competing in beauty pageants around that same time. In many of the events, she competed without hair. In fact, three of the five times she attempted to become Miss Delaware, Kayla was bald. She wore a blond wig the last time she competed, winning the competition in 2010. That win put her in position to take part in the Miss America Pageant.

Ms. Martell has used beauty pageants to help educate the public about alopecia. She compares wearing a hairpiece to other beauty queen traditions, like false eyelashes and hair weaves.

She says it is important for people to understand the emotional and social pressure that alopecia sufferers experience. She advises people with alopecia to contact a support group to tell them that they are not alone. She also says the most important form of beauty is inside out, not outside in.

Kayla Martell did not win the 2011 Miss America Pageant. But she was one of the top 10 finalists. And her public comments have helped raised public understanding of alopecia.

Except for their hair loss, many people with alopecia are healthy individuals. And, since the hair follicles are not dead, some people with alopecia can experience periods of hair growth. Ms. Martell's hair grew during the Miss America competition. Alopecia patients may grow and lose their hair several times during their life.

Scientists are not exactly sure what causes alopecia areata. It is not clear why the body's white blood cells begin to attack the cells in the hair follicles. There is no cure for the disease and no effective treatment that works for everyone.

In 2010, researchers at Columbia University Medical Center in New York reported findings that they hope will help lead to a cure. The researchers found eight genes they believe may be important in causing the condition. They said many of the genes are also linked to autoimmune diseases. These include rheumatoid arthritis, type 1 diabetes and celiac disease, a condition that affects the digestive system.

There are already effective treatments available for many of these conditions. Other treatments are being developed. The researchers say these treatments could prove to be promising for alopecia patients.

Angela Christiano is a professor at Columbia University Medical Center. She also suffers from alopecia areata. She says the study gives hope that there may someday be a cure for the condition.

The researchers studied 1,054 cases from the The National Alopecia Areata Registry. They looked for similarities in the genes that people with different levels of alopecia carry. They found that those with 13 to 14 similar genes had diseases that did not progress. Those with 16 or more similar genes usually progressed to alopecia universalis, or total baldness.

The researchers hope to develop a genetic test to predict the severity of the disease. Professor Christiano says the next step is to repeat the study in future research, with a larger number of patients.

This Science in the News was written by June Simms, who was also our producer. I'm Shirley Griffith.

And, I'm June Simms. Join us again next week for more news about science on the Voice of America.

相關閱讀

WHO says the H7N9 Bird Flu Virus is Unusually Dangerous

Space Flights Can Harm Astronauts' Health

Gay NBA Player Breaks Athletic Barrier

May Day Rallies Held Around the World

(來源:VOA 編輯:Julie)

 
中國日報網英語點津版權說明:凡注明來源為“中國日報網英語點津:XXX(署名)”的原創作品,除與中國日報網簽署英語點津內容授權協議的網站外,其他任何網站或單位未經允許不得非法盜鏈、轉載和使用,違者必究。如需使用,請與010-84883561聯系;凡本網注明“來源:XXX(非英語點津)”的作品,均轉載自其它媒體,目的在于傳播更多信息,其他媒體如需轉載,請與稿件來源方聯系,如產生任何問題與本網無關;本網所發布的歌曲、電影片段,版權歸原作者所有,僅供學習與研究,如果侵權,請提供版權證明,以便盡快刪除。

中國日報網雙語新聞

掃描左側二維碼

添加Chinadaily_Mobile
你想看的我們這兒都有!

中國日報雙語手機報

點擊左側圖標查看訂閱方式

中國首份雙語手機報
學英語看資訊一個都不能少!

關注和訂閱

本文相關閱讀
人氣排行
熱搜詞
 
精華欄目
 

閱讀

詞匯

視聽

翻譯

口語

合作

 

關于我們 | 聯系方式 | 招聘信息

Copyright by chinadaily.com.cn. All rights reserved. None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited. 版權聲明:本網站所刊登的中國日報網英語點津內容,版權屬中國日報網所有,未經協議授權,禁止下載使用。 歡迎愿意與本網站合作的單位或個人與我們聯系。

電話:8610-84883645

傳真:8610-84883500

Email: languagetips@chinadaily.com.cn

在线观看电影av| 亚洲欧美视频在线观看| 成人精品免费视频| 国产一区二区不卡| 美女视频黄 久久| 爽好久久久欧美精品| 亚洲精品少妇| 在线观看的日韩av| 综合激情在线| 久久精品影视| 亚洲v在线看| 91视频精品| 婷婷精品进入| 999国产精品| 久久免费大视频| 999国产精品视频| 国产精品成人a在线观看| 色爱综合网欧美| 91日韩免费| 伊人久久大香线蕉精品组织观看| 日韩精品诱惑一区?区三区| 国产欧美日韩精品一区二区免费| 国产91久久精品一区二区| 夜色77av精品影院| 国产成人av| 欧美综合另类| 欧美h版在线| 欧美aⅴ99久久黑人专区| 综合激情网站| 99精品国产在热久久下载| 一本综合精品| 久久亚洲色图| 久久电影网电视剧免费观看| 久久99精品久久久久久久久久久久| 久久成人羞羞网站| 成人涩涩免费视频| 91啪亚洲精品| 亚洲国产成人一区二区三区| 中文字幕亚洲不卡| 亚洲午夜电影网| 日韩欧美高清在线视频| 欧美亚洲日本一区| 欧美一区二区三区视频在线 | 欧美激情四色| 亚洲深夜激情| 美女视频免费一区| 成人一道本在线| 久久麻豆一区二区| 中文字幕一区二区三区乱码在线| 亚洲一区视频在线| 在线观看一区日韩| 欧美一区2区视频在线观看| 亚洲国产欧美在线成人app | 国产精品小仙女| 99久久99久久精品免费观看| 欧美激情一区二区三区不卡 | 亚洲制服少妇| 捆绑调教一区二区三区| 成人性生交大片免费看中文网站| 久久久www成人免费毛片麻豆| 中文字幕中文乱码欧美一区二区| 亚洲 欧美综合在线网络| 欧美午夜精品久久久久久超碰| 日韩视频一区二区| 国产一区二区久久精品| 久久久久国产精品免费| 久热中文字幕精品视频在线| 在线观看岛国片| 九色porny蝌蚪视频在线观看| 在线观看av网| caoporn免费在线视频| 第84页国产精品| av成人男女| 999精品在线| 亚洲在线日韩| 成人国产精品视频| 最新久久zyz资源站| 色香蕉成人二区免费| 日韩精品中午字幕| 最近2019年好看中文字幕视频| 欧美精品xxx| 麻豆国产在线视频| 成人黄色免费电影| 九九热视频在线观看| av手机免费在线观看| 国产亚洲字幕| 日韩在线看片| 日本不卡的三区四区五区| av网站一区二区三区| 一区二区三区中文免费| 欧美精品 日韩| 中文字幕亚洲一区| 中文乱码字幕av网站| 美女免费黄色| 色猫av在线| 超碰成人av| 成人看片黄a免费看视频| 亚洲精品二区三区| 国产精品中文欧美| 亚洲欧美另类久久久精品2019| 欧美亚洲国产怡红院影院| 亚洲欧美精品在线| 亚洲一卡2卡三卡4卡2021四卡| www.wu福利视频18| 国产永久免费高清在线观看| 不卡av影片| 蜜桃精品噜噜噜成人av| 免费亚洲婷婷| 久久精品人人做| 色久优优欧美色久优优| 亚洲女人天堂色在线7777| 男人先锋资源| 美女的尿口免费视频| 182tv在线播放| 伊人精品综合| 在线视频观看日韩| 99re免费视频精品全部| 欧美日韩午夜激情| 亚洲色在线视频| 四虎a级欧美在线观看| 国产夫妻视频| wwww亚洲| 亚洲精华一区二区三区| 日韩国产欧美三级| 国产精品国产自产拍高清av| 欧美一区二区精品在线| 久久久久久久久久久91| eeuss影影院www在线播放| 丝袜美腿美女被狂躁在线观看| 伊人亚洲精品| 国产一区欧美| 久久日韩精品一区二区五区| 欧美性xxxxxxxx| 久久亚洲成人精品| 免费黄色a网站| 在线免费av网站| 欧美一区在线观看视频| 一本久道综合久久精品| 国产欧美日韩视频在线观看| 制服丝袜av成人在线看| 麻豆国产精品va在线观看不卡| 黄页网址大全免费观看| 在线看黄色av| 成人性生交大片免费看96| 欧美资源在线| 亚洲视频网在线直播| 亚洲国产欧美一区| 欧美第一页草草影院浮力| 亚洲高清福利| 国内自拍亚洲| 在线亚洲伦理| 国产精品毛片久久久久久| 日韩亚洲欧美综合| 中文字幕av高清| 天天在线女人的天堂视频| 色999韩欧美国产综合俺来也| 激情另类综合| 国产精品传媒入口麻豆| 亚洲精品99久久久久中文字幕| 小早川怜子痴女在线精品视频| 天堂在线中文字幕| 国产一区一区| 男人的j进女人的j一区| 香港成人在线视频| 精品国产一区久久久| www.青草| ****av在线网毛片| 色综合天天爱| 国产亚洲欧美日韩俺去了| 日韩欧美亚洲国产精品字幕久久久| 狠狠鲁男人天堂| 国产小视频免费在线网址| 中文一区二区三区四区| 理论片日本一区| 色老头久久综合| 亚洲成人先锋电影| 国产在线观看网站| 香蕉一区二区| 成人精品视频一区二区三区| 欧美一区二区三区在| 欧美亚洲另类在线观看| 久久综合网导航| 精品日韩免费| 久久亚洲私人国产精品va媚药| 精品成人a区在线观看| 国产hs免费高清在线观看| 肉肉视频在线观看| 久久久久国产| 中文字幕日韩av资源站| 最新亚洲国产精品| av毛片免费| 99re久久| 蜜芽一区二区三区| 欧美午夜精品电影| 欧美爆操老女人| 99自拍视频在线观看| 99久久这里只有精品| 国产校园另类小说区| 亚洲成人精品av| 嫩草影院视频| 亚洲精华液一区二区三区| 狠狠综合久久av一区二区老牛| 国产精品久久久久影视| 中文字幕欧美日韩在线| 四虎影视av| 日韩一区二区三区在线免费观看 | 亚洲人成电影在线播放| www.操.com| 亚洲1234区| 亚洲欧美日韩国产综合精品二区| 精品久久久久久电影| 久久久视频在线| 欧美成熟毛茸茸| 亚洲精品国产setv| 国产日产精品一区| 亚洲夜晚福利在线观看| 天天摸天天做天天爽| jizz久久久久久| 欧美特黄一区| 精品久久久久久中文字幕| 久久青草福利网站| 久久这里精品| 精品午夜久久| 18欧美乱大交hd1984| 色青青草原桃花久久综合| 国产视频青青| 涩涩屋成人免费视频软件| 国产精品99久久久久久宅男| 91精品国产综合久久精品图片| 国产偷窥女洗浴在线观看亚洲| 欧美videos另类精品| 欧美精品日韩| 亚洲国产cao| 性欧美xxxx| 337p日本欧洲亚洲大胆鲁鲁| 九九视频免费观看视频精品| 国产精品家庭影院| 色综合久综合久久综合久鬼88| 男人天堂亚洲二区| 日韩国产一区| 亚洲国产中文字幕| 欧美亚洲激情视频| 91caoporm在线视频| 亚洲经典一区| 午夜成人免费视频| 一色屋成人免费精品网| 天堂网在线最新版www中文网| 可以免费看不卡的av网站| 欧美专区亚洲专区| 最新福利小视频在线播放| 成人国产网站| 国产成人精品午夜视频免费| 日韩精品在线观看一区| 小次郎av收藏家| 另类春色校园亚洲| 国产亚洲短视频| 久热精品视频在线| 欧美成人精品一区二区男人看| 欧美黄色一区| 欧美香蕉大胸在线视频观看| 热re99久久国产精品| 麻豆mv在线观看| 国产精品一区二区在线观看网站| 亚洲成人网久久久| xxxx影院| 伊人春色之综合网| 欧美国产亚洲另类动漫| 久久999免费视频| 天堂аⅴ在线地址8| 亚洲欧洲一区| 欧美视频完全免费看| 国产伦精品一区二区三区视频小说 | 午夜在线不卡| 国产精品久久久久久麻豆一区软件| 亚洲第一福利一区| 久久99精品这里精品3| 日韩中文视频| 2017欧美狠狠色| 欧美日本高清一区| 69成人在线| 免费在线成人网| 亚洲一级免费视频| 久草视频视频在线播放| 国产一在线精品一区在线观看| 亚洲香肠在线观看| 色啪啪.com| 日本一区二区三区播放| 国产欧美久久久精品影院| 欧美激情综合亚洲一二区| 色婷婷视频在线观看| 麻豆成人久久精品二区三区红 | 日本综合在线| 琪琪一区二区三区| 日韩精品久久久久久久玫瑰园| 一级片免费在线观看| 国产精品久久占久久| 欧美另类videos死尸| 啊啊啊射了视频网站| 欧洲毛片在线视频免费观看| 亚洲二区在线视频| 一级毛片美女欧洲| 国内毛片久久| 亚洲最大成人网4388xx| 66av国产| 国产毛片久久久| 亚洲老妇xxxxxx| www.91av.com| 超碰97成人| 亚洲一区二区中文在线| www.国产在线观看| 天堂网av成人| 欧美性生活大片免费观看网址| www色啪啪| 欧美freesex8一10精品| 亚洲码国产岛国毛片在线| 国产情侣高潮对白| 亚洲资源在线| 亚洲精品福利视频网站| 又黄又免费的视频| 色爱综合av| 欧洲国内综合视频| 三年片观看免费观看大全视频下载| 外国成人免费视频| 亚洲а∨天堂久久精品9966| 你懂得网站在线| 日本不卡视频在线| 亚洲娇小xxxx欧美娇小| 午夜在线播放| 国产一区不卡视频| 欧美肥婆姓交大片| 精品欧美日韩精品| 国产精品久久久99| 直接看的黄色网址| 日本在线电影一区二区三区| 欧美日韩国产高清一区二区三区 | 希岛爱理一区二区三区av高清| 久久综合久久久久88| 欧美xxxxx18| 秋霞影视一区二区三区| 日本久久精品电影| 中文字幕中文字幕在线中文字幕三区 | 亚洲成人套图| 久久99精品视频| 欧美精品久久久久久久免费观看| 91p九色成人| 亚洲综合成人网| www亚洲天堂| 狠狠色综合网| 亚洲精品第一页| 欧美女同一区| 久久男人中文字幕资源站| 欧美sm视频| 欧美综合在线视频观看| 日本高清不卡视频| 香蕉国产在线| 视频一区二区欧美| 欧美成人午夜激情| 小说区图片区亚洲| 亚洲成av人片在线观看| 福利在线免费| 日韩av在线发布| 久久久久久国产精品美女| 色综合久久久| 91官网在线免费观看| 亚洲精品97久久久babes| 久久国产精品无码网站| 中文字幕42页丝袜| 中国av一区| 91精品国产高清一区二区三区蜜臀| 日韩av成人| 激情另类小说区图片区视频区| 97不卡在线视频| 国产在线不卡一区二区三区| 欧美在线你懂得| 高清美女视频一区| 国产一区二区三区在线看麻豆| 亚洲精品国产一区二区| 亚州综合一区| 欧美www视频| 日韩伦理在线| 一区二区三区在线视频免费| yellow网站在线观看| 男人的天堂成人在线| 欧美疯狂做受xxxx高潮| 深夜福利一区| 精品三级av在线| 91福利在线免费| 久久在线观看免费| 99色在线播放| 久久久久久网| 77777亚洲午夜久久多人| 先锋影音国产精品| 亚洲国产欧美在线成人app | 狠狠鲁男人天堂| 女人av一区| 亚洲欧美国产一区二区三区| 在线观看欧美日韩电影| 亚洲国产裸拍裸体视频在线观看乱了 | 在线激情av| 成人精品国产免费网站|