BIOL 2200 Chapter Notes - Chapter 42: Gastrovascular Cavity, Extracellular Fluid, Pulmonary Circulation
17 Apr 2017
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42. 1 circulatory systems link exchange surfaces with cells throughout the body. Gastrovascular cavities: in cnidarians, the gastrovascular cavity functions to distribute substances throughout body, opening in one end connects cavity to surrounding water, invertebrates with flat bodies optimizes gas exchange by increasing surface area. Open and closed circulatory system: 3 basic components of circulatory system: circulatory fluid, set of interconnecting vessels, a muscular pump (heart, open circulatory system. Hemolymph interstitial fluid/circular fluid that bathes body cells. Heart contraction pumps hemolymph through circulatory vessels into space surrounding organs. When heart relaxes, hemolymph drawn back in through pores. Less costly in terms of energy: closed circulatory system. Blood circular fluid bound to vessels and distinct from interstitial fluid. Heart(s) pump blood into large vessels that branch out into smaller ones which infiltrate body"s organs. High blood pressure enables effective delivery of o2 and nutrients in larger and more active animals.
