人体的各个机能系统的活动都是互相联系,互相制约的。在这种联系制约中,神经系统起着重要的作用。如人体在做剧烈运动或劳动时,由于肌肉活动加强,通过神经系统的调节作用使循环、呼吸、能代谢等机能均增强,以适应机体对氧气和营养物质的需求,从而保证机体同内、外环境变化维持着动态平衡。人类的大脑,由于在长期生产劳动过程中逐渐发展成为具有思维能力的器官,因而人类不只是被动地适应自然环境的变化,而且能主动地认识世界和改造世界。 The body’s various functions of the system are linked to each other, each other’s activities. In this connection, the nervous system plays an important role. Such as the human body to do strenuous exercise or labor, due to muscle activity to strengthen, through the regulation of the nervous system so that circulation, breathing, metabolism and other functions are enhanced to meet the body’s oxygen and nutrient needs, thus ensuring the body with the internal, Changes in the external environment to maintain a dynamic balance. As human brain gradually evolves into a thinking organ in the long-term production of labor, human beings not only passively adapt to changes in the natural environment, but also know the world and transform the world initiatively.