What controls the movement of a sea star's arms?

The movement of a sea star's arms is controlled by a complex system of muscles and a water vascular system. The water vascular system, which operates through hydraulic pressure, allows sea stars to extend and retract their tube feet located on the underside of their arms. By contracting and relaxing specific muscles, they can coordinate movements, enabling them to crawl, capture prey, and navigate their environment effectively. This unique system is central to their locomotion and feeding behavior.