动物和人体生命活动是一个不断变化的过程,如人体与外界不断地进行着物质交换、能量转换和信息传递,体内成千上万种化学反应在同时进行,但即使外界环境发生剧烈变化,人体在正常情况下均能通过自身的调节作用维持内环境的相对稳定,保持器官之间功能的协调以及对外界 Animal and human life activities are an ever-changing process. For example, the human body and the outside world continue to carry out material exchange, energy conversion and information transmission. Thousands of chemical reactions in the body are carried out simultaneously. However, even if the external environment changes dramatically, Under normal circumstances can be through their own regulatory role to maintain the relative stability of the internal environment, to maintain the coordination between the functions of organs and to the outside world