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饥饿的大脑人脑里每秒钟要发生10万个化学反应,这需要耗费巨大的能量。事实上,人脑和肌肉运动一样,要消耗许多高浓缩热量。这就是为什么思考和身体锻炼一样让人筋疲力尽的原因。由于没有神经末梢,大脑可以在毫无感觉的情况下被灼伤、冰冻或切割。事实上,神经外科医生常在不施麻醉药的情况下做手术(头疼是在脑外发生的)。外科医生用电刺激颞叶,可以探测患者的记忆,把生动的记忆带回现实。刺激脑的某一部位,可以引起其它部位的反应,比如刺激大脑顶叶,可以引起手颤。敏感的鼻子鼻粘液始终是对付成千上万的细菌的第一道防线。那些在鼻粘液中发现的幸免于难的细菌会被胃酸驱走、吞没或消失。花粉微粒面对的是另一种截然不同的防御系统。它们进入鼻粘液后所生成的化学物质会引起过敏,导致打喷嚏。喷嚏以每小时100英里的速度将花粉微粒驱出体外。鼻孔血管的大小,几小时就会改变一次,因此,一个人的鼻孔总是大小不一。贪婪的眼睛 1997年,人们发现一粒花籽在
Hundreds of thousands of chemical reactions occur every second in the brain of a hungry brain, which takes a great deal of energy. In fact, the human brain, like the muscles, consumes a lot of highly concentrated heat. This is why thinking about the same exhausting as physical exercise. Without nerve endings, the brain can be burned, frozen or cut without any sensation. In fact, neurosurgeons often operate without anesthetics (headaches occur outside the brain). Using electrical stimulation of the temporal lobe, surgeons can detect the patient’s memory and bring vivid memory back to reality. To stimulate a certain part of the brain, can cause reactions in other parts, such as stimulating the parietal lobe, can cause hand tremor. Sensitive nose nasal mucus is always the first line of defense against thousands of bacteria. Those bacteria that are found in the nasal mucus that are hard to find will get rid of or disappear from the stomach acid. Pollen particles face another completely different defense system. The chemicals they create when they enter the nasal mucus can cause allergies, causing sneezing. Sneeze drives the pollen grains out of the body at 100 miles per hour. The size of the nostril blood vessels changes in a few hours, so one’s nostrils are always different sizes. Greedy eyes In 1997, people found a seed in