Sea star - Wikipedia, the free encyclopedia
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Sea stars (also often called "starfish") are echinoderms belonging to the class Asteroidea . The names "sea star" and "starfish" are sometimes differentiated, with "starfish" used in a broader sens...
en.wikipedia.org/wiki/Sea_star
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Kingdom Animalia; Phylum Echinodermata; Class Asteroidea; Starfish - diagram of the water vascular system;
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www.esu.edu/~milewski/intro_biol_two/lab__13_echinoderm...
www.esu.edu/~milewski/intro_biol_two/lab__13_echinoderm/starfish_diagr_water_vasc.html
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Some of this water is diverted into the periviscerial coelom (the large cavity in which major organs are suspended), where it is circulated by the beating of cilia. Most oxygen enters the starfish via diffusion into the tube feet (with the water vascular system), or the papulae (small sacs covering the upper body surface.
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www.swordfishingcentral.com/starfish.html
www.swordfishingcentral.com/starfish.html
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In order to release the suckers, the longitudinal muscles contract and force the water back into the ampullae. By the joint action of the starfish's many tube feet, the animal moves forward about six inches a minute ... Free Internet Encyclopedia > Letters > W > Water vascular system...
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new-encyclopedia.info/W/Water_vascular_system.asp
new-encyclopedia.info/W/Water_vascular_system.asp
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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 ...
http://wiki.answers.com/Q/How_does_the_water_vascular_s...
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Water enters the system through the sieve plate, and then flows through the ring canal around the mouth. From the ring canal the water flows through the radial canal in the feet. The radial canal is connected to the tube feet which has hund...
http://wiki.answers.com/Q/How_does_the_water_vascular_s...
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For some time it has been presumed, and is still presented or indicated in some textbooks, that the fluid contained within the starfish water vascular system is pumped by ciliary activity through the madreporite into the canal system, although it has been pointed out that no experimental evidence supports this assumption2.
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www.nature.com/nature/journal/v262/n5569/abs/262577a0.h...
www.nature.com/nature/journal/v262/n5569/abs/262577a0.html
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rydberg.biology.colostate.edu/Dissections/asterwvs.htm
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The Crinoid Water Vascular System ... Echinoderms are characterized by a unique coelomic water vascular system. This is a hydraulically controlled system consisting of a circumoral ring around the esophogus with connecting radial canals each leading to an ambulacrum.
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www.ucmp.berkeley.edu/echinodermata/circum_ring.html
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