Ch50_Lecture_Spr11

Ch50_Lecture_Spr11 - 50 Circulatory Systems 50 Circulatory...

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Circulatory Systems 50
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www.olympusmicro.com/galleries/abramowitz/images / 50 Circulatory Systems 50.1 Why Do Animals Need a Circulatory System? 50.2 How Have Vertebrate Circulatory Systems Evolved? 50.3 How Does the Mammalian Heart Function? 50.4 What Are the Properties of Blood and Blood Vessels? 50.5 How Is the Circulatory System Controlled and Regulated?
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50.1 Why Do Animals Need a Circulatory System? A circulatory system consists of: A muscular pump – the heart A fluid – blood A series of conduits – blood vessels Together these are called the cardiovascular system www.olympusmicro.com/galleries/abramowitz/images/ Capillary bed injected with dye
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50.1 Why Do Animals Need a Circulatory System? Some animals do not need circulatory systems: Single-celled organisms exchange nutrients, gases, wastes directly with their environment Structures and flattened body shapes increase surface area to enhance exchange between cells and environment E.g. gastrovascular cavities – highly branched cavity in flatworms and cnidarians bring environment inside animal http://webpages.ursinus.edu/jsidie/pictures
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50.1 Why Do Animals Need a Circulatory System? Larger animals must use circulatory systems 2 and remove 2 Cells are supported by extracellular fluid for nutrient delivery and waste removal Fluid in circulatory system ( blood plasma ) Fluid around cells ( interstitial fluid ) www.meddean.luc.edu/lumen/MedEd/Histo/HistoImages Longitudinal sections of capillaries in connective tissue supporting cardiac muscle cells
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50.1 Why Do Animals Need a Circulatory System? Extracellular fluid in an open circulatory system : Combines with fluid of circulatory system — hemolymph Fluid leaves circulatory system and moves between cells then returns to be pumped again Know differences and examples of open vs. closed systems Jump to slide #15
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50.1 Why Do Animals Need a Circulatory System? Extracellular fluid in a closed circulatory system : Refers to fluid in the circulatory system and outside it Fluid in the circulatory system is blood plasma Fluid around cells is interstitial fluid
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50.1 Why Do Animals Need a Circulatory System? Open circulatory system – extracellular fluid: A pump ( heart ) moves hemolymph through vessels Fluid leaves vessels and passes by cells through intercellular spaces aided by muscular movement as animal moves Fluid returns to heart (s) through ostia or open vessels Arthropods, mollusks, and many other invertebrates www.microscopy-uk.org.uk/mag/imagsmall/
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Figure 50.1 Circulatory Systems (A, B) Crayfish heart http://www2.gsu.edu/~bioasx/crayheart.gif These are examples of an open circulatory system. Note ostia in crayfish heart above.
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50.1 Why Do Animals Need a Circulatory System? Closed circulatory system
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This note was uploaded on 06/06/2011 for the course BSC 2011 taught by Professor Presley during the Spring '11 term at FAU.

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Ch50_Lecture_Spr11 - 50 Circulatory Systems 50 Circulatory...

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