The P wave represents depolarization of the atria, the QRS complex occurs during the depolarization of the ventricles, and the T wave represents repolarization of the ventricles at the beginning of diastole. Procedures - 1. We will only use one recording so enlarge your page by moving your cursor to the bottom of the first panel and dragging it to the bottom of the screen. Press the start icon on the computer screen and recording will begin. To stop recording, press the stop icon.
Any movement can cause great fluctuations in the electrical impulses picked up by the leads.
To sharpen your image you can change the time of recording or voltage. Repeat this process at 10 minute intervals until resting cardiac rate is established. You can measure the variation in the time required for each complete heart cycle by recording the time elapsed from the beginning of one P wave to the beginning of the next P wave. Repeat this measurement for 10 complete heart cycles. Cellular respiration consumes oxygen and produces carbon dioxide as a waste product.