Phylum Annelida
Annelids include earthworms to leeches. They can be found in varying environments: salt water, fresh water, and soils. The bodies of annalids are separated into segments. Their circulatory system varies from each specific organism. Most have a closed circulatory system, in which blood is closed within vessels throughout the body, while others (leeches) have an open circulatory system, in which their blood is not contained within vessels. In an open circulatory system, the blood fluid in the "coelomic cavity" is within contact with entirety of the inner organism, in which nutrients, particles, and gases are exchanged.
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Haemadipsa Picta
The Haemadipsa are a group of jawed leeches, whose bites can be felt. There are also known to be "blood-thirsty." Like other leeches, the Tiger Leech has an open circulatory system, in which particles and gases are transmitted and exchange through direct contact with coelomic-blood fluids not contained in vessels. Its blood fluids are exposed within the organism. |
Eisenia fetida
It is an earthworm that can often be found among decaying organisms. Decaying plants and manure are some of their habitats. Like all earthworms, they have a closed circulatory system, but also have a coelomic system. There are five major vessels: the dorsal vessel carries blood forward while the other four longitudinal vessels move blood towards the back. The coelomic system works with the closed system, acting as a "heart" that pumps fluids through the vessels. Non-living cells released from the digestive lining in the coelom also transport food and heal other parts as they circulate.
It is an earthworm that can often be found among decaying organisms. Decaying plants and manure are some of their habitats. Like all earthworms, they have a closed circulatory system, but also have a coelomic system. There are five major vessels: the dorsal vessel carries blood forward while the other four longitudinal vessels move blood towards the back. The coelomic system works with the closed system, acting as a "heart" that pumps fluids through the vessels. Non-living cells released from the digestive lining in the coelom also transport food and heal other parts as they circulate.
Alvinella pompejana
The Pompeii Worm can be found in the Pacific Ocean in the extreme conditions of hydrothermal vents. Their bodies can tolerate up to 176 degrees. The Pompeii Worm has a closed circulatory system with two main blood vessels: one that push blood forward and another that pushes blood back, with smaller vessels throughout. There is no heart, but muscles help pump blood throughout.
The Pompeii Worm can be found in the Pacific Ocean in the extreme conditions of hydrothermal vents. Their bodies can tolerate up to 176 degrees. The Pompeii Worm has a closed circulatory system with two main blood vessels: one that push blood forward and another that pushes blood back, with smaller vessels throughout. There is no heart, but muscles help pump blood throughout.