What is the tem for divider between heart chamber walls?

The term for the divider between heart chamber walls is "septum". The septum separates the heart into four chambers: two atria (upper chambers) and two ventricles (lower chambers). The atrial septum divides the left and right atria, while the ventricular septum divides the left and right ventricles. The septum prevents oxygen-rich blood from mixing with oxygen-depleted blood, ensuring that oxygen-rich blood is pumped out to the body and oxygen-depleted blood is pumped to the lungs to be re-oxygenated.