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Demonstrates how a heart actually functions as two pumps in one. Scenes at an amusement park show the effects of activity on the heart. Scenes of the internal heart are matched with still drawings and animations that depict the heart's valves, muscle, and pacemaker. The effects of diet and exercise on the heart are mentioned.
Follows the journey of a red blood cell around the circulatory system to demonstrate the efficient and elegant design of oxygen and food delivery to all parts of the body and the removal of wastes before they can do harm. Shows how the veins and arteries are structured to perform their tasks: muscular arteries to transmit the force of the heartbeat, veins with valves to insure the blood's return to the heart.