The Electrocardiogram: an interactive exercise
Read these instructions before starting!
This applet lets you draw a typical ECG, given information about blood pressure and volume at corresponding times in the cardiac cycle. 
The applet is divided into four zones, each corresponding to a different segment of the ECG.

• Click on the screen where you see "Start Here".  Keep the mouse button pressed down and drag the arrow across the screen, tracing out the shape of the ECG. 
• As you enter each new zone a popup window will appear, explaining the changes in blood pressure and volume which are occurring during the time interval which you have just entered. 
• Use the information from the pressure and volume curves, and the popup windows, to guide you in your drawing - this will help you understand the relationship between electrical excitation, pressure and volume events in the heart.