What is the heart divided in two by?

The heart is divided into two halves by a muscular wall called the septum. This septum separates the right and left sides of the heart, with the right side responsible for pumping deoxygenated blood to the lungs and the left side pumping oxygenated blood to the rest of the body. Each half consists of an atrium and a ventricle, facilitating the heart's vital functions in circulation.