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Circulatory System

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The Circulatory System Types of circulation: Gastrovascular cavities- Digests and distributes nutrients throughout the body of hydras and cnidarians. Open circulatory system- Blood and interstitial fluid are separated. This fluid is called hemolymph. The heart(s) pump hemolymph into sinuses where chemical exchange occurs between hemolymph and body cells. Open circulatory systems are in insects and arthropods. Advantages of an open circulatory system are less energy costly because of their low hydrostatic pressures and need less energy to maintain because they have no blood vessels.

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