Human closed circulatory system, with one heart actively pumping. The earthworm also has a closed circulatory system, with blood entirely contained within dorsal and ventral vessels . Human kidneys filter blood from the circulatory system. Each nephridium has a funnel-like tubule and its own pore to the outside. Human dorsal central nervous system.
Earthworms are hermaphroditic but reproduce by cross mating and fertilizing.
Internally, testes are associated with seminal vesicles for own sperm storage and ovaries are associated with oviducts for egg deposition out the female pore. After two or three hours of copulating, the worms separate and each wiggles off a slime tube from around the clitellum toward the head. The slime tube acts as a cacoon for the eggs to hatch. The burrowing life. An earthworm uses its prostomium as a burrowing probe, since can elongate with contraction of circular muscles.