P wave = spread of excitation wave over the atria just before
contraction;
QRS wave = spread of excitation wave over the
ventricles as the ventricles contract;
T wave = electrical recovery
and relaxation of ventricles.
Disclaimer: This blog may contain information, excerpts, or materials collected from various websites and other sources for educational, learning, and research purposes. Some content may be quoted, summarized, or reproduced to help share useful knowledge and information with readers. I do not claim ownership of content created by others, and all rights belong to their respective authors, publishers, and copyright holders. Whenever possible, credit and links to the original source are provided