The division of the cells is occurring continuously in a person's body. The cells divide in order to replace the old and damaged cells, and so that the body of the living being can grow. The growth of the body occurs due to the division of the component cells. Although different types of the somatic cells divide at different rates depending on the length of the G1 phase of the cell cycle. Every somatic cell needs to be replaced at different rates, such as the skin cells needs to be replaced much more frequently than the other cells.