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期末大考和高考临近,考生们日夜紧张地复习迎考,用脑强度大大增加,脑组织“超负荷”运转,往往产生“脑疲劳”现象,出现头晕、失眠、记忆减退和反应迟钝等现象。复习迎考是一项繁重而艰苦的脑力劳动。大脑是人体代谢最旺盛、最活跃、消耗能量最多的组织,它仅占体重的2豫,但却分享全身20豫的血液供应,消耗全身25豫的能量。大脑所需的这么多能量主要通过血糖获得。当人体空腹时,每100毫升血液里含的血糖不足80
Final exams and college entrance examination approaching, candidates day and night review review, with a significant increase in brain strength, brain tissue “overload ” operation, often have “brain fatigue ” phenomenon, dizziness, insomnia, memory loss and response Bovine and other phenomena. Review of examination is a heavy and arduous mental work. The brain is the most energetic, active and energy-consuming organization in the human body. It accounts for only 2% of the body weight but shares 20% of its blood supply and consumes 25% of its body energy. The amount of energy the brain needs is mainly gained by blood sugar. When the body is fasting, blood glucose per 100 ml contains less than 80