The term "ventricles" refers to the hollow chambers found in the heart and the brain. In the heart, there are two ventricles: the right ventricle, which pumps blood to the lungs, and the left ventricle, which pumps oxygenated blood to the rest of the body. These chambers play a crucial role in the circulatory system, ensuring that blood flows efficiently. In the brain, there are four interconnected ventricles filled with cerebrospinal fluid. This fluid cushions the brain, provides nutrients, and removes waste. The brain's ventricles help maintain a stable environment for proper neurological function, highlighting their importance in both the cardiovascular and nervous systems.