Chapter 42 notes

Chapter 42 notes - Chapter 42 Circulation and Master...

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Click to edit Master subtitle style 6/13/11 Chapter 42 Circulation and Gas Exchange
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6/13/11 Concept 42.1: Circulatory systems link exchange surfaces Transport systems functionally connect the organs of exchange with the body cells Figure shown
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6/13/11 Gastrovascular Cavities Simple animals like cnidarians have a body wall only 2 cell-layers think between external environment & gastrovascular cavity Gastrovascular cavity functions both in digestion and circulation Figure 42.2
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6/13/11 More Complex Animals Have Two Types of Circulatory Figure 42.3 Open circulatory system: blood bathes the organs directly e.g., arthropods & most molluscs Closed circulatory system: blood is confined to vessels and is distinct from the interstitial fluid e.g., some invertebrates and all vertebrates
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6/13/11 Circulatory System Parts Both of these types of systems have three basic components 1. A circulatory fluid (blood) 2. A set of tubes (blood vessels) 3. A muscular pump (the heart)
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6/13/11 Vertebrate Circulatory Figures 42.4 & 42.5
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6/13/11 Clicker Question An open circulatory system _____. Does not have blood vessels Allows blood and interstitial fluid to mix with each other * Does not have a hear to pump the blood Consists of a gastrovascular cavity
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6/13/11 Concept 42.2: Coordinated cycles of heart contraction drive double circulation in mammals
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6/13/11 The Mammalian Figure 42.6
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6/13/11 The Mammalian Heart Figure 42.7
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6/13/11 The Cardiac Cycle Cardiac Cycle: rhythmic contraction and relaxation of the heart Systole: contraction or pumping phase Diastole: relaxation, or filling, phase Figure 42.8
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6/13/11 Electrical Impulses Pacemaker cells Heart cells that regularly produce spontaneous electrical impulses Impulses spread throughout hear-muscle cells and stimulates them to contract
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This note was uploaded on 06/13/2011 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 42 notes - Chapter 42 Circulation and Master...

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