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Echinoderms (water vascular system (shomookh alkhayat, enable echinoderms…
Echinoderms
water vascular system
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enable echinoderms to move and gain food , its system of a fluid filled closed tubes that work together.
the strain like opening to the vascular water is madreporite
The structure of the endoskeleton is important for determining the type of movement an echinoderm can undertake. The movable bony plates in the endoskeletons of echinoderms enable them to move easily.
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Respiration , circulation and excretion (Johara Eidan)
respiration :
- Oxygen diffuses from the water through the thin membranes of the tube feet. Some echinoderms carry out diffusion of oxygen through all thin body membranes in contact with water
- other echinoderms have thin-walled skin gills that are small pouches extending from the body.
- Echinoderms also use their tube feet in respiration
- many sea cucumbers have branched tubes called respiratory trees
circulation :
- takes place in the body coelom and the water-vascular system
- cilia move water and body fluids throughout these systems aided by pumping action in some echinoderms
excretion :
- cellular waste occurs by diffusion through thin body membranes
Lama Alduailej
Response to stimuli: chinoderms have both sensory and motor neurons with varying degrees of complexity in different species. Sensory neurons respond to touch, chemicals dissolved in the water, water currents, and light
Movement :The structure of the endoskeleton is important for determining the type of movement an echinoderm can undertake. The movable bony plates in the endoskeletons of echinoderms enable them to move easily.
Lean Alsuwailem
Feeding Strategies of Echinoderm
Sea stars
They feed by grasping the prey, then
everting their stomach and secreting
primary enzymes on the prey.
Sea lilies and feather stars
They extend their arms and trap food
Sea urchins
use teethlike plates to scrape algae
off surfaces or feed on other animals.
Sea cucumbers
extend their branched, mucus-covered
tentacles to trap floating food.