Bio 201 F08 True lect 13v4r

Bio 201 F08 True lect 13v4r - Medical/Family excuses Must...

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Medical/Family excuses • Must present documentation to Diane Pauciullo or Ellen Lopez in Undergraduate Biology • Must notify me by the end of the day of the exam – A makeup exam will be scheduled
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Phylum mollusca (mollus k s)
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Theme: evolutionary novelty Many novel traits in mollusks – Shell secreted by mantle • Different shapes, configurations, losses of shell Radula for feeding Cephalopod novelties – Closed circulatory system – Propulsion – Nervous system
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Basic mollusk body plan Highly reduced coelom
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LIFE 8e Fig. 32.14 Mollucs: three basic body parts: foot, visceral mass, mantle
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Shell Shell Secreted by mantle mollusks
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Mollusks - digestive system Have a complete (one way) gut Radula - chitinous ribbon (chitin=hard polysaccharide- protein material, mineralized in mollusks) with rows of teeth used for feeding Stomach has crystalline style rotating rod ofenzymes in gelatinous form keeps gut contents moving enzymes dissolve from style and digest food
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“Tooth” morphology in mollusk radulae Great diversity Some species grind wood Others break/grind Calcium carbonate Many other types
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Circulatory System open in all classes except cephalopods Cephalopods are the only mollusks with a closed circulatory system. Hydrostatic skeleton (all mollusks except cephalopods) uses incompressibility of Fuids to generate forces to antagonize muscles and support body mollusks
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two “gill hearts” (“branchial hearts”) pump blood through gills then a single heart pumps oxygenated blood to rest of body http://www.utmb.edu/nrcc/generic_cephalopod_illustrations.htm Cephalopod closed circulatory system
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Major Classes of mollusks (Phylum Mollusca) • Polyplacophora - chitons – “Polyplacophores” • Gastropoda - snails, slugs – “Gastropods” • Bivalvia - clams, oysters, mussels, scallops – “Bivalves” • Cephalopoda - squid, octopus – “Cephalopods”
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This note was uploaded on 04/14/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F08 True lect 13v4r - Medical/Family excuses Must...

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