A brief review of the academic discipline of physiology is given, including a discussion of similarities: 1) of design and function in organelles and organs; 2) between the negative feedback mechanisms of the heating-cooling systems of our houses and of our bodies; and 3) of the homeostatic functions of a giant airport and our body’s hormonal system. Six body systems are examined with respect to their precise, purposeful functions. A look at the evolutionary beliefs of physiologists, and at vitalism versus mechanism reveals that evolutionism is on unstable foundations. The exceptional arrangement and precise operation of its physiological systems clearly indicate that the human body was created by a Divine Designer, and raise serious doubts about whether such systems could have arisen by chance.