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我们的脑子,尤其是大脑,一般在13岁到“岁就基本发育成熟了。男子到25岁,女子到20岁时重量已达到了它们的最大值,男子平均脑重约1300克,女子平均脑重约1200克,一般男人不少于1000克,女人不少于900克,脑重过低,智力就会显著下降。脑在人体各器官中占支配地位,有“司令部”之称。脑对外界的各种刺激在进行综合、分析、判断、推理、概括、储存的时候,其活动是十分激烈的,此时在脑细胞中进行着复杂的生物化学反应,据研究,脑子在紧张的活动时,每克脑组织在十秒钟内就大约会产生出14×10~(-5)卡的热量,并放出CO_2和水,这就充分说明,脑组织在活动时进行了物质代谢。在脑内参加代谢的主要物质是葡萄糖。可是在100克脑组织中也只有0.04克葡萄糖,而这点葡萄糖仅能维持脑的活动10分钟。
Our brains, especially the brains, are basically mature at the age of 13. Men up to 25 years of age have reached their maximum weight by the age of 20, with men weighing about 1300 grams on average, and women on average The brain weight is about 1200 grams, the average man is not less than 1000 grams, the woman is not less than 900 grams, the brain is too low, the intelligence will be significantly decreased.And the brain in the human body organs dominance, the “headquarters” said. The various stimuli of the brain to the outside world in the synthesis, analysis, judgment, reasoning, generalization, storage, its activity is very intense, this time in the brain cells in a complex biochemical reactions, according to the study, the brain is nervous Of the activity, each gram of brain in about ten seconds to produce about 14 × 10 ~ (-5) card heat, and release CO_2 and water, which fully shows that when the brain tissue material metabolism The main substance involved in metabolism in the brain is glucose, but there is only 0.04g of glucose in 100g of brain tissue, and this glucose can only maintain brain activity for 10 minutes.