体内营养物质在生物氧化过程中不断产能，这些能量除小部分被机体所利用，其他大部分都转变成热能，其中部分热能是体温的来源。由于人类有完善的的体温调节体制，即使在环境温度、运动等因素影响下，体内产热和散热两个生理过程也能取得动态平衡，从而使体温保持相对恒定。l体 Nutrients in the body in the biological oxidation process of continuous production capacity, except for a small part of these energy is used by the body, most of the other into heat, some of which is the source of body temperature. Due to the perfect human body temperature regulation system, even under the influence of ambient temperature, exercise and other factors, the two physiological processes of heat production and heat dissipation in the body can achieve a dynamic balance so as to keep the body temperature relatively constant. l body