Annelids have closed circulatory systems, meaning the blood moves through pressurized vessels. find the dorsal blood vessel and the ventral blood vessel. how does blood move from one to the other? blood is pumped by 5 vessels that encircle the esophagus—locate them. what structure in your body are these 5 pumping vessels analogous to? what are some evolutionary advantages of a closed circulatory system, over relying on diffusion through the body wall as in flatworms and nematodes?
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Annelids have closed circulatory systems, meaning the blood moves through pressurized vessels. find...
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