日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

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





 
為什么血是紅的
[ 2008-01-25 15:53 ]

我們的血為什么是紅色的?是什么東西給它染了色?看了下面這篇文章,你就能了解一些了。

The blood flowing through thearteries,capillaries, andveinsof our bodies contains many different materials and cells, each with a different function.Plasma, the liquid portion of the blood, comprises more than half of the blood. Plasma is light yellow in color, and is thicker than water, because it contains many substances, in addition to the actual blood cells. These substances include proteins, antibodies that combat disease,fibrinogenthat helps blood clot,carbohydrates, fats, salts, and others.

Red blood cells, orcorpuscles, encased in blood vessels, color the blood. Since there are about 35 trillion of these tiny, round, flat discs circulating in one's body at any one time, their sheer number necessarily lends their red color to the blood.

As the young red blood cell matures, and takes on an adult form in the marrow of the bone, it loses its nucleus, and it increases its production ofhemoglobin. Hemoglobin is the red pigment, or color of blood, and contains iron, combined with protein.

When blood passes through the lungs, oxygen piggybacks on the hemoglobin of the red cells. From there, the red cells carry the oxygen through the arteries and the capillaries to all other cells of the body. Carbon dioxide from the body cells returns to the lungs through the veins in the same manner, by attaching to the hemoglobin.

Red blood cells have a life expectancy of approximately four months, before they are broken up, primarily in the spleen, and are replaced by new red blood cells. New cells are continuously generated to replace the old cells that have past their prime, and have been destroyed to make room for the younger generation.
Let's not forget that, in addition to red blood cells, we also have several types of white blood cells!

arteries 動脈

capillaries 毛細管

veins 紋理

plasma 血漿

fibrinogen 纖維蛋白原

carbohydrate 碳水化合物

corpuscles 觸覺小體

hemoglobin 血色素

(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
 
 
 

本頻道最新推薦

     
  為什么血是紅的
  Where is Mama?
  "生日快樂"歌的起源
  誰發明了鉛筆
  I can fly!

論壇熱貼

     
  how to say 實名制 in English?
  我知道這些年你也不容易!
  A Gift from Heaven
  Forever at your feet
  Why We Love(e-c)practice
  破罐子破摔




主站蜘蛛池模板: 91精品成人免费国产 | 中文字幕第二页 | 国产精品久久久精品 | 欧美黄视频 | 午夜激情爱爱 | 欧美黄视频 | 日韩福利在线观看 | 欧日韩在线视频 | 午夜精品在线视频 | feise.av| 日韩不卡在线 | 亚洲影院一区 | 一区二区三区高清 | 99在线免费观看 | 午夜免费 | 免费国产一区二区 | 青娱乐欧美视频 | 精品福利视频在线观看视频 | 日本精品中文字幕有码 | 日韩欧美亚洲在线 | 午夜精品一区 | 精品国产乱码久久久久久1区2区 | 天天精品在线 | 国产大陆精品另类xxxx | 美日韩一区二区三区 | 日韩欧美亚洲视频 | 日本高清无遮挡 | 日韩精品一区在线 | 日韩欧美h| 三级网址在线播放 | 日日摸狠狠的摸夜夜摸 | 日韩欧美一区二区视频 | 久爱视频www在线播放 | 欧美a在线观看 | 亚洲国产成人av好男人在线观看 | 日韩欧美一区二区三区四区 | 99国产在线精品视频 | 亚洲黄色网址 | 日韩电影免费在线观看中文字幕 | 成人福利在线免费观看 | 成人一级视频 |