Question

short notes of water vascular system in starfish.

Answer 1

The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration.[1] The system is composed of canals connecting numerous tube feet. 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 retract.[1][2]

The exact structure of the system varies somewhat between the five classes of echinoderm. The system is part of the coelomic cavities of echinoderms, together with the haemal coelom (or haemal system), perivisceral coelom, gonadal coelom and perihaemal coelom.[3]

Other terms sometimes used to the water vascular system are "ambulacral system"[4][5][6] and "aquiferous system". In the past, "aquiferous system" was also used to many unrelated invertebrate structures,[7][8] but today is restricted to water channels in sponges[9] and the hydrostatic skeleton of some mollusks like Polinice

Answer 2

"Water vascular system. The water vascular system is a hydraulic system used by echinoderms, such a sea stars and a sea urchins for locomotion,food and waste transformation and respiration. The system is composed of canals connecting numerous tube feet."
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