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Arthropods have a body plan that includes an internal body cavity called a hemocoel, with the organs and cells bathed in a fluid called hemolymph. This fluid combines the functions of lymph and blood as in vertebrates. It is rich in nutrients: carbohydrates like sugars, protein, fats, etc. The fluid circulates mostly by draining into special pores and being drawn up by a dorsal heart to be distributed. Because of the simplicity of this system some advantages are gained but it is difficult to divert the hemolymph to a specific location. The body movements assist in distribution of the fluid.

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12y ago

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