Echinoderms lack respiratory systems. Tube feet and skin gills are used for gas exchange.
Tube feet immensely contribute to the respiratory function in most echinoderms; the tissue’s outer thin wall forms the main respiratory surface. The paper-like wall is suitable for the diffusion of oxygen into the body cavity and the diffusion outward of carbon dioxide and wastes. However, many groups have developed skin gills (auxiliary respiratory structures).
Tube feet immensely contribute to the respiratory function in most echinoderms; the tissue’s outer thin wall forms the main respiratory surface. The paper-like wall is suitable for the diffusion of oxygen into the body cavity and the diffusion outward of carbon dioxide and wastes. However, many groups have developed skin gills (auxiliary respiratory structures).
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