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In the cell membrane, hydrophilic heads orient to the inside and outside of the membrane, with the hydrophobic molecules inside. This gives the membrane its semi permeable fluid nature.he hydrophilic region in the cell is water-loving and it  attracts the water molecules. It is basically composed of polar  groups which readily dissolve and absorb water.
Functions of the hair fiber and hair follicle. The main function of the hair follicle is to produce a hair shaft or fiber. The shaft is the physically visible portion of the hair and plays a significant role both biologically and psychologically. The hair shaft is composed of three parts â the cuticle, the cortex and the medulla.