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ECHINODERMS (Feeding And Digestion (Sea Stars (prey on alot of mollusks…
ECHINODERMS
Feeding And Digestion
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sea urchins
use teethlike plates, shown to scrape algae off surfaces
sea cucumbers
extend their branched, mucus-covered tentacles to trap floating food.
Movement
feather stars
move by grasping the soft sediments of the ocean bottom with their cirri long, thin appendages on their ventral sidesor by swimming with up-and-down movements of their arms.
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Water vascular system
Water vascular system:a system of fluid-filled, closed tubes that work together to enable echinoderms to move and get food.
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Tube feet :are small, muscular, fluid-filled tubes that end
in suction-cuplike structures and are used in movement, food collection, and respiration
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Respiration, circulation, and excretion
Respiration:
-Echinoderms also use their tube feet in respiration
-Oxygen diffuses from the water
-Other echinoderms have thin-walled skin gills that are small pouches extending from the body
Circulation:Circulation takes place in the body coelom and the water- vascular system,
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Response to stimuli
-have both sensory and motor neurons,Sensory neurons respond to touch, chemicals dissolved in the water, water currents, and light
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