Answer:
The structure that separates the lower chambers of the heart is called the ventricular septum. The ventricular septum is a thick muscular wall that divides the heart's lower chambers, namely the left ventricle and the right ventricle. It ensures the separation of oxygenated and deoxygenated blood and prevents the mixing of blood between the two ventricles. This division is vital for the heart's efficient pumping function, as the left ventricle pumps oxygenated blood to the body, while the right ventricle pumps deoxygenated blood to the lungs for oxygenation.
Step-by-step explanation: