Supplys the ventral side with blood
no
no
yes.
Blood vessel on the bottom of a worm Blood vessel on the bottom of a worm
I always got dorsal (down the back or spine) and ventral (down the underside) confused, until I thought of an easy way to remember it. The ventral goes down to where the animal "vents" (poops). So the dorsal blood vessel is the vessel that runs down the back, while the ventral blood vessel runs down the underside.
I think its dorsal. REALLY sure.
digestive
There are two. The main one which is viewable through the skin is the dorsal blood vessel. The smaller one found under the intestine is the ventral blood vessel.
Blood moves through the ventral blood vessel to the posterior of the body and through the dorsal vessel to the anterior of the body. The dorsal blood vessel contracts to push the blood back and then forward to the ventral vessel where a series of aortic arches act as hearts to move blood forward to the anterior end and through the capillaries.
The median dorsal vessel on a worm carries the blood to the anterior end of the worm, while the median ventral vessel carries the blood to the posterior end of the worm.
The function of an earthworm's aortic arches are to pump blood to the ventral blood vessel and into the body.