Ch 42 %28doc%29 - CHAPTER 42 Slide: 1 Circulation & Gas...

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CHAPTER 42 Slide: 1 Ch 42 Slide: 2 Constraint: Physical Laws All cells must exchange materials with the environment. O 2 , CO 2 , H 2 O, NH 3 , nutrients Direct exchange w/ environment NOT possible for most cells Slide: 3 Circulatory System Transport system that connects “organs of exchange” w/ entire body Allows all cells to exchange w/ the environment Allows communication between different organs and organ systems Slide: 4 Variation in Circulation Simple animals vs complex animals Simple animals Gastrovascular cavity Functions in: Digestion Distribution of substances throughout entire Body (i.e. “circulation”) Nutrients need to diffuse through 1 cell layer Figure 40.3 (Campbell 8th ed) Slide: 5 Variation in Circulation Simple animals Gastrovascular cavity Some organisms have more elaborate GVCs Planarian: highly branched GVC and flat body Jellies: Elaborate GVC w/ ciliated cells to move substances Radial canal Circular canal No Heart, but have ciliated cells Figure 42.2 (Campbell 8th ed) Slide: 6 Variation in Circulation Complex animals 3 Components: - Fluid - Tubes - Pump Open System vs Closed System
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Slide: 7 Variation in Circulation Complex animals Closed System Blood never leaves tubes and moves in one direction; O 2 rich blood doesn’t mix w/ O 2 poor blood nor waste (NH 3 ) O 2 /nutrients/NH 3 Open System Tubes open-ended; Tissues/organs in hemocoel bathe in hemolymph Hemolymph: analogous to blood + interstitial fluid O 2 rich and poor hemolymph and waste (NH 3 ) mix Occurs in arthropods & mollusks Figure 42.3 (Campbell 8th ed) Slide: 8 Open circulatory system Lower pressure so requires less energy Closed circulatory system Higher pressure allows distant delivery (i.e. bigger bodies) Allows for a design in which oxygenated and deoxygenated blood is not mixed Slide: 9 Closed Circulatory System Consists of blood vessels and a 2 to 4 chambered heart Blood vessels Heart → Arteries → Arterioles → Capillaries → → Venules → Veins → Heart Heart chambers Atria (1-2) Ventricles (1-2)
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This note was uploaded on 11/08/2011 for the course BSC 2011C taught by Professor Klowden/crampton during the Fall '11 term at University of Central Florida.

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Ch 42 %28doc%29 - CHAPTER 42 Slide: 1 Circulation & Gas...

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