BIO 123 Chapter Notes - Chapter 42.1042.3: Gastrovascular Cavity, Extracellular Fluid, Pulmonary Circulation
26 Feb 2019
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Concept 42. 1: circulatory systems link exchange surfaces with cells throughout the body. Central gastrovascular cavity: functions in the distrubution of substances throughout the body as well as in digestion. Planarians and other flatworms also survive without a circulatory system. Three basic components: a circulatory fluid, a set of interconnecting vessels, and a muscular pump, the heart. Open circulatory system: the circulatory fluid (hemolymph) is also the interstitial fluid that bathes body cells. Closed circulatory system: circulatory fluid called blood is confied to vessels and is distinct from the interstitial fluid. Open circulatory system: lower hydrostatic pressures allow less energy usage. Closed circulatory system: high enough blood pressure to enable the effective delivery of o2 and nutrients in larger and more active animals. Cardiovascular system: describe the heart and blood vessels in verterbraes. Arteries: carry blood from the heart to organs throughout the body branch into arterioles capillaries. Veins: carry blood back to the heart. Arteries arterioles capillaries venules veins.
