Earthworms maintain homeostasis by having a dual circulatory system, which contains the closed circulatory system and the coelomic fluid for respiratory gases, food and waste. The circulatory system is comprised of five major blood vessels: two lateroneural vessels, a subneural vessel, a ventral vessel and a dorsal vessel.
The earthworm's body is segmented, with segments six through 11 acting as hearts and pumping dissolved hemoglobin and ameboid cells throughout the body. The digestive cells release non-living cells when full, which help in the healing process and move food through the digestive tract. Earthworms eat soil filled with nutritious, decomposing organic matter. Earthworms surface during the night to feed, but during the day they can dig down to 6 feet deep.