Zoology - Body Fluids and Circulation Question with Solution | TestHub

ECG is an electrocardiogram that is a graph that represents heart activity. This is recorded by a machine known as an electrocardiograph. This is recorded using six chest leads and three limb leads. This graph shows many peaks that are designated by alphabets P to T. P marks the beginning and T is the end of the graph. Heart activity begins with the help of sino atrial node and this is represented by a P wave. Hence P wave denotes atrial depolarization. QRS represents ventricular systole and the ending of this is represented by T wave.