The human heart is a fist-sized, muscular organ situated slightly left in the chest. It features four chambers—two atria and two ventricles—that work together to circulate blood. The right side pumps deoxygenated blood to the lungs, while the left side distributes oxygen-rich blood to the body.

In a 3D model, the heart's intricate structure is visible, including the valves that ensure unidirectional blood flow and the major blood vessels like the aorta and pulmonary arteries. The model highlights the heart's three layers: the epicardium (outer), myocardium (muscle), and endocardium (inner). This detailed representation enhances understanding of the heart’s essential role in the circulatory system