This program offers viewers an x-ray of a beating heart and its sounds from a stethoscope. Dr. Russell H. Morgan uses a model to describe the construction and function of the heart and its arteries, veins, and chambers. An animation shows the flow of blood through the heart. In a filmed sequence, a patient is injected with uricon so that a slow-motion x-ray view of his blood can be seen passing through his heart and lungs.