男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

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





  How do insects breathe?
[ 2006-07-05 10:30 ]

昆蟲很容易被淹死,這個大家都知道。那昆蟲能不能被掐死呢?讀了下面這篇文章你就會知道了。

Insects breathe in a way that is very different from us. Instead of having a central place to gather oxygen and a transport system to deliver the oxygen to all of the cells of the body like us, insects have a system of fine branching tubes called a tracheal system that delivers the oxygen directly to each cell in the body.

When breathed in an insect, an oxygen molecule in the atmosphere enters a tiny hole on the insect's thorax or abdomen called a spiracle. The spiracle is the opening of a long tube called tracheae. Then the oxygen molecule proceeds down the tracheae, which is a long, air-filled, branching tube. It continues to move through branches until  reach a tiny, fluid-filled, dead end called tracheole, and dissolve in the fluid. From the fluid, it diffuses or moves across the wall of the tracheole into an insect cell such as a muscle cell.

The movement of air through the tracheal system of most insects relies solely on diffusion. Because most insects rely on diffusion, which occurs best over small distances, they cannot get very large. You will not see huge ants, like in the movie "Them," because enough air could not diffuse that far into their bodies to keep their cells alive. However, some larger insects can use their abdominal muscles to force air in and out of the tracheal system in a limited way.

So, with this system in mind, it would be difficult to strangle a bug. However, if the tracheal system fills with water, it takes much longer for air to diffuse through the system. Therefore, an insect can drown fairly easily.

spiracle: 通氣孔

tracheole: [昆]微氣管

tracheal system: 氣管系統

diffusion: 擴散

abdominal: 腹部的

strangle: 扼死

(英語點津 Annabel 編輯)

 
 
 




主站蜘蛛池模板: 苗栗市| 横山县| 康保县| 金乡县| 集贤县| 海原县| 南平市| 通榆县| 北海市| 渝北区| 连山| 南岸区| 尤溪县| 宽甸| 定南县| 内江市| 万州区| 尼木县| 太湖县| 内丘县| 遵义县| 璧山县| 含山县| 岗巴县| 高阳县| 禄丰县| 寿宁县| 巧家县| 拜泉县| 岳西县| 高要市| 都安| 亳州市| 西充县| 平安县| 彰化市| 顺昌县| 汤阴县| 夏邑县| 邹平县| 廊坊市|