L23 Circulation II - CIRCULATION II Most evolutionary...

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CIRCULATION II Most evolutionary changes occurred in heart and aortic arches, associated with mode of respiration (gills to lung) Both gills and lungs e.g. lungfish ( Protopterus ) New invention is a pulmonary circulation so they have a branchial circulation + pulmonary circulation and a new vessel the pulmonary vein (carries blood from lung to atrium) evolved To divert from one to the other there are constrictions in the vessels
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AQUATIC heart 2, 5, 6 arches for oxygenation dorsal aorta block on pulmonary artery prevents going to lung ductus arteriosus 3 rd th arches – no gills New inventions – pulmonary artery, valves, ductus arteriosus (name only) X X X X LUNGFISH I
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AIR BREATHING (foreshadows tetrapods) O2 poor blood, right side of atrium spiral valve in conus 6 th aortic arch, shunted into 6 th to bypass gills ductus arteriosus valve closed so to pulmonary artery to lung pulmonary vein left atrium compartment arches 3 & 4 to dorsal & ventral aorta New inventions – partially separated sinus venosus, spiral valve in conus arteriosus, valves X X X LUNGFISH II
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This note was uploaded on 08/28/2011 for the course ZOO 3713c taught by Professor Staff during the Spring '08 term at University of Florida.

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L23 Circulation II - CIRCULATION II Most evolutionary...

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