The amazing complexity of human anatomy and physiology is dependent upon its single most basic unit: the cell. Humans can attribute their overall health to homeostasis, the balance of activity within properly functioning cells. Additionally, cells are affected by the food we eat along with the microscopic entities that make us ill. This book covers how cells work to maintain human health and immunity as well as the history of cell discovery and the basics of cellular activity. Readers will also learn the processes of illnesses and corresponding genetics that compromise a cell's proper activity in the human being.