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有的同学学习十分勤奋,可是效果却不好。这是什么原因呢?我们得从大脑的活动说起。如果让一个人躺在一台精密的天平上,当他思考问题时,他头部那边的天平就会下沉。这是因为他的大脑在工作,血液较多地流向了那里。根据相关资料,大脑用功时所需的血液要比肌肉工作时所需的血液多15到25倍。所以,脑力劳动是并不轻松的,消耗的能量也是非常多的。另外,人的神经细胞有兴奋与抑制两种功能,大脑皮层的细胞兴奋能
Some students study very hard, but the effect is not good. What is the reason? We have to start with the activities of the brain. If you let a person lie on a precision balance, the balance on the other side of his head will sink when he thinks about the problem. This is because his brain is working, where blood flows more. According to the relevant information, the brain needs 15 to 25 times more blood than is required for the muscles to work. Therefore, mental work is not easy, the energy consumed is also very large. In addition, the human nerve cells are excited and inhibit two functions, the cell cortex excited