Echinoderms do not have a specialized excretory system. Excretion is accomplished by simple diffusion of metabolic wastes (ammonia) across thin permeable regions of the body wall. The excretion of solid wastes is processed through the anus. Brittle stars are a exception because they have a blind gut, therefore excrete solid wastes through the mouth.
Sunday, April 22, 2007
Excretion
Echinoderms do not have a specialized excretory system. Excretion is accomplished by simple diffusion of metabolic wastes (ammonia) across thin permeable regions of the body wall. The excretion of solid wastes is processed through the anus. Brittle stars are a exception because they have a blind gut, therefore excrete solid wastes through the mouth.
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