Or How to Examine Your Inside from the Outside
The Royal Institution Annual Christmas Lectures to Young People by Heinz Wolff of the Medical Research Council 2: Pumps, Pipes and Flows
At one time the heart was thought to be the very seat of life and love; we now know that the heart is simply a pump, or to be more precise a double pump, keeping the vital blood in circulation. How this circulation is regulated is the subject of tonight's lecture and we shall measure how much blood the heart is actually pumping without spilling a single drop.
Television presentation by BRIAN JOHNSON