What is the function of dorsal blood vessels do on worm?

Dorsal blood vessels in worms, particularly in annelids like earthworms, function as part of the circulatory system. They help transport blood from the posterior (tail) end of the worm to the anterior (head) end. This vascular network is essential for delivering nutrients and oxygen to the worm's tissues, as well as facilitating the removal of metabolic waste. Overall, it plays a crucial role in maintaining the worm's internal environment and overall health.