That an earthworm has no heart? Instead, it has five aortic arches that act as hearts. These “hearts”, with no chambers, help pump blood. The worm has two main blood vessels that extend through its body: the ventral blood vessel leads blood to the posterior end and the dorsal vessel leads it to the anterior end. The dorsal vessel pumps blood forward and the “hearts” pump it into the ventral vessel. From there the blood is distributed into capillaries on the body wall and other organs.