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Gastrovascular cavity

33

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An Introduction to Invertebrates Chapter 33 Porifera (Sponges) Parazoa (no true tissue) Sedentary (Sessile) Suspension Feeders Choanocytes (Collar Cells) Cnidarians (Hydras, Corals, Jellies) Eumetazoans (True Tissue) Diploblastic Radial Body Plan Gastrovascular cavity Single opening serves as anus and mouth Lophotrochozoans Eumetazoans Bilateral Symmetry Triploblastic Lophotrochozoans Platyhelminthes (Flatworms) Triploblastic acoelomates Ex. Planarians Platyhelminthes (Flatworms) Trematodes (parasitic flukes) Platyhelminthes (Flatworms) Tapeworms (parasitic flatworm) Scolex proglottids Lophotrochozoans Rotifers Alimentary canal Pseudocoelomates parthenogenesis Lophotrochozoans Lophophorates Have crown of ciliated tentacles around mouth Coelomates

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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