Using a straightforward systems approach, Turnock's Public Health: What It Is and How It Works explores the inner workings of the complex, modern U.S. public health system--what it is, what it does, how it works, and why it is important.Divided into two parts, Part I of the text focuses on the key elements of public health practice in 21st century America, while Part II offers case studies designed to emphasize what public health is and how it works...