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眼睛像一架奇特的照相机,它能在光谱上区分150多种颜色,其内含有1200万个视杆细胞和650万个视锥细胞;耳朵的鼓膜,其表面积有50~90平方毫米;鼻子能闻出2000多种不同的气味,嗅觉接受器——嗅上皮的表面积为500平方毫米。一根头发的直径为105~200微米,其寿命为4年左右,健康人每天要脱40~50根,当然也有新的生长,每根头发一天内大约要长0.4毫米。胡须,男性特有的第二特征,总数达2000~3000根。人体王国的最高司令部由兄弟6人组成,分别是大脑、小脑、眼
The eye looks like a peculiar camera that can spectrally distinguish more than 150 colors, which contains 12 million rods and 6.5 million cones; the tympanic membrane of the ears, which has a surface area of 50-90 mm2; the nose Over 2000 different scents can be heard. The olfactory receptor, the surface area of the olfactory epithelium, is 500 square millimeters. A hair diameter of 105-200 microns, and its life expectancy is about 4 years, healthy people take off 40 to 50 per day, of course, there are new growth, each hair length of about 0.4 millimeters a day. Beard, male-specific second features, the total number of 2000 to 3000. The highest command of the human kingdom consists of six brothers, namely the brain, cerebellum, eyes