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工作到深夜了,或早上刚起床,常常接連打几个呵欠。誰都知道,打呵欠表示疲倦,但是这种动作有什么生理意义呢?下面試以生理学的一种学說作一个通俗的解释。我们知道,人的一切活动都是在高級中樞神經系統的支配下工作的,大脑皮层是中樞神經系統的最高部位,一切活动都直接地或間接地由大脑皮层支配。高級中樞神經系統工作的特点是兴奋与抑制的矛盾斗争,当某些中樞处于兴奋的时候,其他中樞则处于抑制状态,得到休息,兴奋达至頂点时,抑制也达
Work late into the night, or just get up in the morning, often playing several yawns. Everyone knows that yawning means being tired, but what are the physiological implications of this kind of movement? Below is a general explanation of physiology. We know that all human activities are under the control of the advanced central nervous system. The cerebral cortex is the highest part of the central nervous system. All activities are directly or indirectly controlled by the cerebral cortex. Advanced central nervous system work is characterized by the conflict between excitement and inhibition. When certain centers are excited, other centers are in a state of inhibition. When they get rest, the excitement reaches its peak.