The task of internal transport relys on many different systems in the echinoderms. Gas exchange (respiration) and the elimination of wastes is taken care of by skin gills and tube feet. Tube feet are an essential part of the water vascular system, this is used for many things, one of which is the transportation of waste. It is made of channels connectig to several tube feet. Water first enters the madroporite, located on the dorsal side of the echinoderm, and then continues through the stone canal and is greeted by the ring canal. The water then diverges into five different radial canals, that further transform into a bubble like structure called, ampullae. The final exit point is the tube feet, which are connected to the ampullae. Echinoderms have an open circulatory system, which means blood does not travel within blood vessels.
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