Zoology - Body Fluids and Circulation Question with Solution | TestHub

The record of the electrical activities of the heart is called an electrocardiogram (ECG). The waves of ECG include PQRS waves. P wave-which represents the depolarization of the atria, the QRS complex, which represents the depolarization of the ventricles, and the T wave represents the ventricular repolarization. The waves above the isopotential line are called positive waves and the ones below it are called negative waves. P, R and T are positive waves while Q and S are negative wave. R is the tallest wave which is a part of QRS complex.