Similarities and differences of earthworm and human circulatory system?

Naturally human bodies are much more complex than those of worms. For instance, humans have skeletal system, while worms are invertebrates. They also have a very weak nervous system which doesn't allow them to feel any pain. Humans generally have good senses we can taste, touch, hear, smell, and see well (we can also feel pain). Worms only have eye spots which give them awareness on the level of light in their environment however don't actually give them vision. Worms have two main blood vessels: a dorsal and a ventral vessel. These vessels circulate blood from the head to the tail of their bodies. The blood is moved from waves of contraction in the vessel. Both humans and worms are alike in that they both have what is referred to as a 'closed circulatory system'. However in our system we have only one heart and the two fluids we transport are blood and lymph; meanwhile worms have 5 hearts which circulate blood.

In a worms excretory system basically food goes in the mouth and comes out the opposite end. of an earthworm is very simple. In short, food goes in one end and comes out the other. Niphridia helps to absorb some water during the process. They are found in pairs in every segment except the first 3 and the last one. Niphridia are to worms what kidney's are to humans.