医用英语选读(十一)

作     者：缪成森 

出 版 物：《安徽医学》 (Anhui Medical Journal)

年 卷 期：1988年第3期

页      面：64-65页

主　　题：body 营养物质 细胞器 充氧 

摘      要：All the cells of the body are equipped with the necessary organelles for carrying on an independent existence. They can provide for their energy needs by oxidizing food material, and they can synthesize the nucleic acids and proteins required for their maintenance and reproduction. They are surrounded by membranees adapted for the intake of oxygen and nutrients. But these are obtainable only from the external environment. Most of the cells of the body have no contact with the external environment. They are entirely dependend upon the transportation function of the circulatory system for supplies of oxygen and nutrients. Again, the cells have no direct contact with the circulating blood, the actual environment