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教材分析人体内血浆和组织间液都是细胞外液,是细胞直接生活的环境,因此细胞外液也被称为机体的内环境。只有保持内环境的相对稳定,才能维持人体正常的生理活动。而内环境的相对稳定则有赖于循环系统的心脏作为动力,推动血液在血管内进行循环,由血液把细胞在代谢时所需的氧和其它物质带来,也由血
Textbook analysis Human plasma and interstitial fluid are extracellular fluid, is the direct living environment of cells, so extracellular fluid is also known as the body’s internal environment. Only to maintain the relative stability of the internal environment in order to maintain the normal physiological activities of the human body. The relative stability of the internal environment depends on the heart of the circulatory system as a motivation to promote the blood circulation in the bloodstream, the blood cells required for metabolism of oxygen and other substances brought, but also by the blood