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What system do roundworms not have?

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While nematodes have digestive, reproductive, nervous and excretory systems, they do not have discrete circulatory or respiratory systems.


Do roundworms have respiratory system?

Roundworms have no circulatory or respiratory systems so they use diffusion to breathe and for circulation of substances around their body.

What organ systems do roundworms have?

A roundworm has a complete digestive system, which includes both a mouth and an anus. This is a significant difference from the incomplete digestive system of flatworms. The roundworm digestive system also include a large digestive organ known as the gut.

Does a roundworm have a 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 a central nervous system?

In their overall structure, all nematode nervous systems exhibit a number of common, invariant features. The central nervous system consists primarily of a so-called circumoral brain or nerve ring, consisting of annular neuropil that encircles the neck of the pharyngeal muscle (Figure 1).

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