Describe the water vascular system of a sea star.

The water vascular system is a unique and distinctive feature of echinoderms, including sea stars. This system plays a crucial role in various physiological functions, such as locomotion, respiration, and prey capture.

The water vascular system consists of a network of fluid-filled canals, tube feet, and a central ring canal. The system is filled with seawater, and its hydraulic pressure is maintained by a ________ ______ _______ ______ _______ _________ __________ ______ _________.
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