人脑约由140亿个神经元组成,里面贮存了大量的信息。在一般的情况下,人仅动用其中的一部分信息来完成思维、判断和理解。 当人们受到外界条件紧迫的刺激时,交感神经立即处于兴奋状态,肾上腺髓质会随之迅速地释放出大量的肾上腺素和去甲肾上腺素,在这些激素的作用下,体内的血液循环加快,从而大大改善了头部的供 The human brain consists of about 14 billion neurons, which store a lot of information. Under normal circumstances, people use only part of the information to complete the thinking, judging and understanding. When people are stimulated by the urgent external conditions, the sympathetic immediately excited, adrenal medulla will be followed by rapid release of a large number of epinephrine and norepinephrine, the role of these hormones, the body’s blood circulation to speed up, Thus greatly improving the supply of the head