How does the human heart look like?

The human heart is a muscular pump the siza of a clenched fist. It is divided into four chambers. The two upper chambers are the left and right atria and two lower chambers are the right and left ventricles.
The human heart has 4 kinds of valves, mitral valve, aortic valve, pulmonic valve and tricuspid valve which prevent the backflow of blood between strokes. The mitral and tricuspid valves are classified as the atrioventricular (AV) valves as they are found between the atria and ventricles.
The interatrioventricular septum separates the left atrium and ventricle from the right atrium and ventricle, dividing the heart into two functionally separate and anatomically distinct units.