What is the function of the pedicellariae in a sea star
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: a system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles and tube feet.
The water vascular system of the sea stars open up at the madreporite, a perforated opening in the central part of the animal. Internally, the madreporite leads to a stone canal, made up of skeletal deposits. The stone canal is attached to a ring canal which leads to each of the five (or more) radial canals.
Water vascular system is made of tubes or channels connected to numerous tube feet. The exchange of gases occurs through the body surface and tube feet. … The carbon dioxide from tissues again enters the water vascular system which transports it to body surface for removal from body. This way, it helps in respiration.
How do sea stars walk and grab? They have thousands of bony platelets in their arms that overlap and they have a nerve ring that activates to help the movements of their arms. … Muscles swing it in the direction the sea star wants to move.
Water vascular system is for locomotion, food gathering, respiration and excretion. Set of canals and tube feet that forms a hydraulic system for motion.
The madreporite is an essential part of the circulation system in echinoderms. Through this plate, which is also called a sieve plate, the echinoderm draws in seawater and expels water to fuel its vascular system. The madreporite functions like a trap door through which water can move in and out in a controlled manner.
The water vascular system is not filled with sea water in sea cucumbers, as in sea stars and urchins, but rather with a special body fluid. There is, therefore, no direct interface (madreporite) between the outside water and the internal organs of the animal.
Water vascular system. a system of coelomic canals and tube-feet projections with multiple functions such as locomotion, respiration, transport of food & wastes. ring canal.
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