Features of Roundworms Unlike the flatworms, the roundworms have a body cavity with internal organs. A roundworm has a complete digestive system, which includes both a mouth and an anus. . Roundworms also have a simple nervous system with a primitive brain.
What type of digestive system do roundworms have?
Unlike flatworms or cnidarians, roundworms have a tube-like digestive system that has two openings. Food enters through a mouth and wastes exit the other end of the digestive system. This is an efficient system of digestion, and most complex animals have this system of digestion.
Do roundworms have respiratory or circulatory systems?
Roundworms have no circulatory or respiratory systems so they use diffusion to breathe and for circulation of substances around their body. They are thin and are round in cross section, though they are actually bilaterally symmetric.
Do roundworms have a central nervous system?
Known as the roundworms, nematodes also have some unique body structures, such as their simple nervous system. The nervous system of a nematode runs both the length and width of its body. At the head end we find the head ganglia, which is where the four longitudinal nerve cords fuse into a sort of rudimentary 'brain.
Do roundworms have circulatory system?
While nematodes have digestive, reproductive, nervous and excretory systems, they do not have discrete circulatory or respiratory systems.
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