Certainly blood passes through them as it is circulated throughout the animal. Considering the length of the organism and the size of the heart necessary to move the blood, the arrangement allows for blood to reach the farthest reaches of the worm.Click to see full answer. Simply so, why do worms have 5 hearts?In the worm world, these wonderful earth loving creatures have five blood pumping organs in their tiny, hard working bodies. But the worms’ hearts do not fill up with blood the way humans do, they just squeeze the two blood vessels which help to circulate the blood through out the body.Similarly, why do earthworms have so many hearts? While earthworms may seem simple because they lack many visible external organs, they have complex inner organs including five pairs of heart-like structures called aortic arches, which they use to pump oxygenated blood to the rest of their bodies. Then, do worms have 10 hearts? 2. Earthworms. While it is not technically a “heart,” the aortic arch of the earthworm performs a similar function and is commonly referred to as one for the sake of simplicity. An earthworm has five arches/hearts that are segmented and pump blood throughout its body.Do worms have a brain and heart?Thinking and feeling: Worms have a brain that connects with nerves from their skin and muscles. If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm’s circulatory system, and the worm’s hearts pump the oxygenated blood to the head area.