The cerebellum, located at the base of the brain, is responsible for coordinating movement and balance. It helps to control the smooth and accurate execution of voluntary movements, such as reaching for a glass of water or playing a sport. It also plays a role in maintaining balance and stability, and in some cases, it can even modify movements based on sensory information. In short, the cerebellum helps to regulate muscular activity, but it does not control reflex action, emotional expressions, or the endocrine system.