The human body is made up of more than one trillion cells. They are the tiny building blocks out of which the body's tissues and organs are formed, and together these parts make up a marvelously synchronized, living community. This book uses spectacular medical drawings, plus images derived from new technologies, as an aid to understanding the anatomy and function of the body, and many of its common disorders. Images work together with crystal-clear language to bring the key concepts to life - such as how the heart keeps beating constantly throughout life, or how instructions for the entire body's growth are held in every single cell. Never before has it been possible to learn so much, so quickly, about the human body, both female and male, in sickness and health, and from birth to old age.