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骨骼206块骨头构成人体的支架,对五脏六腑具有重要的保护、支持和运动功能。全身骨骼重约9公斤,占体重的1/5到1/7。五官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。头发一根头发的直径为105~200微米,其寿命为4年左右,健康人每天要脱
Bones 206 bones constitute the body’s support for the internal organs has important protection, support and motor functions. Whole body bones weigh about 9 kg, accounting for 1/5 to 1/7 of body weight. The facial features look like a peculiar camera that can spectrally distinguish more than 150 colors containing 12 million rods and 6.5 million cones; the tympanic membrane of the ear, which has a surface area of 50-90 mm2; Nose can smell more than 2,000 different smells, olfactory receptors - the surface area of the olfactory epithelium is 500 square millimeters. Hair a hair diameter of 105 to 200 microns, its life expectancy is about 4 years, healthy people to take off every day