Monday, March 5, 2007

Circulation/internal transport.

-Because of the flatworm’s shape they don’t have a circulatory or respiratory systems.
-Flatworms use diffusion to transport oxygen and nutrients throughout their body
-ex in an earthworm the circulation system is in a series of closed vessels, the two main vessels are the dorsal and ventral blood vessels. In the dorsal vessel the blood moves towards the anterior and in the dorsal vessel the blood moves towards the posterior.

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