下列关于体温调节的叙述,正确的是( ) A.大脑皮层是调节体温的主

下列关于体温调节的叙述,正确的是(  )

A.大脑皮层是调节体温的主要中枢

B.温觉感受器只分布于皮肤

C.人在剧烈运动时主要产热方式是骨骼肌的收缩

D.降低新陈代谢是人在炎热环境中散热的主要方式

 

答案

C

人体体温的相对恒定是神经—体液共同调节的结果。温觉感受器除分布在皮肤外还分布在黏膜和内脏器官中。环境温度变化刺激这些感受器,感受器产生兴奋就会传到体温调节中枢——下丘脑,通过中枢的分析、综合,再使有关神经兴奋,进而引起皮肤中血管收缩(舒张)等一系列反应,同时,肾上腺素、甲状腺激素的分泌量也产生相应变化,协调完成体温调节。人在安静时产热主要来自内脏,运动时主要来自骨骼肌。

 

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