2)运输和储存功能( Transport and storage) (b) Erythrocytes(红细胞) contain a large amount of hemoglobins(血红蛋白), the oxygen-transporting protein
3)机械功能( Mechanical functions) The protein keratin(角蛋白) is the chief structural components of hair, scales, horn, wool, nails and feathers
4).运动功能 Movement) striated skeletal muscle cell
5)保护功能( Protection)
6)信息传递功能( nformation processing) simple Anatomy of the Retina