Hair - goes on growing after a person dies because the cells of the body go on working until they have exhausted their fuel supply. Human cells have been described as power plants, chemical laboratories, furnaces and factories. they are marvellous structures, which carry out the functions for which they have been designed with great efficiency. The hair follicle is composed of two layers an outer layer of cells forming the outer root sheath and an inner horny layer of horny, fibrous oblong cells. The hair grows upwards from the bottom of the follicle by multiplication of the soft cells, which become elongated and pigmented to form elongated and pigmented to form the fibre like substance of the hair shaft . The soft cells at the base of the follicle need the nourishment brought to them and all the other cells of the body by the blood stream.
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