Zoology - Body Fluids and Circulation Question with Solution | TestHub

The graphical representation of the electrical activity of the heart is called the electrocardiogram (ECG). A standard ECG consists of different waves which correspond to specific electrical event in the heart. First is the P wave which represents the excitation of the atria also known as depolarization of the atria. It leads to contraction of atria. The next is the QRS complex which signifies the depolarization of the ventricles leading to ventricular contraction. T wave corresponds to ventricular repolarisation.