Water Vascular System of Asterias: The water vascular system is the most characteristic system in echinoderms and plays a number of vital functions. Mike Kincaid Recommended for you

In view of the hydrostatic pressure within the water vascular system the possibility of its functioning as a physiological kidney is also discussed.

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In Asterias sp., locomotion is caused by the action of tube-feet.

1.135A) and gives off a system of vessels traversing the body.

Water vascular system of Asterias Bsc medical 2nd semester - Duration: 20:15.

As alternative mechanisms, a slight hypertonicity due to the presence of excess potassium, or water movement as a direct consequence of the operation of an ion pump are discussed. Important parts in the water vascular system or ambulacral system of asterias are listed below: (1)Madreporite: ADVERTISEMENTS: It is a thick sieve like calcareous plate situated on the aboral surface of the central disc. In Asterias it starts with the madreporite (Fig. The un­der­side of the starfish is cov­ered with hun­dreds of tube feet used for walk­ing, at­tach­ing to rocks, and hold­ing on to prey. How to Grow Roses From Cuttings Fast and Easy | Rooting Rose Cuttings with a 2 Liter Soda Bottle - Duration: 28:23. The As­te­r­ias rubens has a water vas­cu­lar sys­tem, char­ac­ter­is­tic of all echin­o­derms, used for lo­co­mo­tion. It bears as many as 250 minute pores …


You tube video. The water vascular system is always filled with fluid and the loss of fluid across the wall of tube-feet during fluid pressure elevation is instanta­neously compensated by the intake of water into the system through the madreporite.