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The circulatory system supplies blood which contains oxygen, nutrients, and other substances to the different cells of the body. 2. An open circulatory system allows blood to be distributed to the different organs in a lower pressure. 3. In a closed circulatory system, blood passes through blood vessels and moves due to a difference in blood pressures.
Rating Newest Oldest. Best Answer: Circulation Spiders have an open circulatory system; i.e., they do not have true blood, or veins to convey it. Rather, their bodies are filled with haemolymph, which is pumped through arteries by a heart into spaces called sinuses surrounding their internal organs.ygalomorph and Mesothelae spiders have two pairs of book lungs filled with haemolymph, where openings on the ventral surface of the abdomen allow air to enter and diffuse oxygen.