2007-03-20 04:51:14 · 0 answers · asked by WEHA 3 in Science & Mathematics ➔ Biology
Earthworms have a closed circulatory system. They have two main blood vessels that extend through the length of their body: a ventral blood vessel which leads the blood to the posterior end, and a dorsal blood vessel which leads to the anterior end. The dorsal vessel is contractile and pumps blood forward, where it is pumped into the ventral vessel by a series of "hearts" (aortic arches) which vary in number in the different taxa. A typical lumbricid will have 5 pairs of hearts; a total of 10. The blood is distributed from the ventral vessel into capillaries on the body wall and other organs and into a vascular sinus in the gut wall where gases and nutrients are exchanged.
2007-03-20 05:09:01 · answer #1 · answered by MSK 4 · 0⤊ 0⤋
Ventral Blood Vessel
2016-12-31 03:21:04 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Dorsal Blood Vessel
2016-11-16 08:42:40 · answer #3 · answered by ? 4 · 0⤊ 0⤋