Invertebrate circulatory systems. Coelomates

Despite their greater potential complexity, many of the minor coelomate phyla (e.g., Pogonophora, Sipuncula, and Bryozoa) contain small animals that rely on direct diffusion and normal muscular activity to circulate the coelomic fluid. All of the major and some of the minor phyla have well-developed blood vascular systems, often of open design.

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