The heart is an organ that pumps blood throughout the body. It comprises four chambers:
- Atria (upper chambers)
- Ventricles (lower chambers)
The wall of the heart is made up of three layers:
- Epicardium- This is a protective layer made of connective tissues.
- Myocardium- This layer forms the heart muscles.
- Endocardium- This is the innermost layer and protects the valves and the heart.