Star of the sea (sea star) are invertebrates Structure, solid surface not adhesion to the muscles. Sea water piping system movement with (water vascularsystem) consists of a
.The madreporite ring canal (ring canal) is a ring surrounding the inlet pipe of the madreporite and the stone canal, opened in this part. The radial canal. (radial canal) is a long tube filed from the ring canal into the arms of each one. Lateral canal (lateral canal).Sticking out from the radial canal side of tube feet (tube feet) has the characteristics of a long tube end ตันท that came from and poured around the canal. Cell differentiation is a closed pipe cylinder.(sucker), late on the other side bulb muscle called the ampulla (ampulla)
.Star of the sea moving by ampulla shrink. To push water along the tube feet make the tube feet stretched out
.When moved to shrink tube feet short. Push the water back into the ampulla. Contraction and relaxation of the tube feet relying on the pressure of water. Don't rely on the antagonism of the muscle. Stretching and contraction of the tube feet.
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