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Introduction This is the last episode of our series, An Essential Guide to Your Body and Brain and in it, we will talk about the body’s life cycle and we will finish the series talking about the aging brain. Audio Episode Episode Transcript 0:03Every human body starts with a meeting of two cells, a sperm cell and an egg cell and develops from that union. Almost immediately, hundreds of other kinds of cells arise, each suited to a particular task, and yet all made up of the same basic parts, dividing, specializing, proliferating and dying, the cells follow instructions encoded into their DNA to become the magnificently coordinated colony, that is the human body. The adult body contains trillions of cells, each with its own life cycle all are born from the Division of pre existing cells, most will grow, divide and eventually die to be replaced by new cells. In some tissues such as those of the skin this cycle runs almost continuously. In yet other tissues such as those of the heart, mature cells cannot divide and damage to the organ is repaired with scar tissue. The processes that control cell birth, death and specialization are still...