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Water Vascular System

The Water Vascular System is a hydraulic system used by echinoderms, such as star fish and sea urchins.

It is a system of fluid filled tubes and chambers that connect with numerous tube feet. The fluid in the water vascular system is under pressure, giving the tube feet their shape.

Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, then relaxing to allow the feet to contract.


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