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关于呼吸系统的英文文章 急需一篇关于呼吸系统的英文文章，要至少2段落，介绍呼吸系统的作用，如何呼吸，万分感谢，谢谢谢谢谢谢谢谢谢谢谢谢 休 闲居 编 辑 >>>>>>>>休闲养生网回答： Respiratory system In living organisms, a respiratory system functions to allow gas exchange. The gases that are exchanged, the anatomy or structure of the exchange system, and the precise physiological uses of the exchanged gases vary depending on the organism. In humans and other mammals, for example, the anatomical features of the respiratory system include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood. This exchange process occurs in the alveolar region of the lungs. [1] Other animals, such as insects, have respiratory systems with very simple anatomical features, and in amphibians even the skin plays a vital role in gas exchange. Plants also have respiratory systems but the directionality of gas exchange can be opposite to that in animals. The respiratory system in plants also includes unique anatomical features such as holes on the undersides of leaves known as stomata. |