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11.7.05 - November 7 Gas EXCHANGE gills Gills mounted on...

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November 7, Gas EXCHANGE: gills Gills mounted on bony gill arches Gill filaments come off arches, which has a huge surface area Oxygen poor blood flows through lamella and go towards oxygen rich blood side. Water flows opposite the blow of blood (countercurrent flow) Countercurrent flow o Very efficient o As water flows one way, blood flows the other, therby becoming more oxygen rich as it goe across. Water Balance Single cell no wall Marine: cell is iso-osmotic to hypo-osmotic environment If you are hypoosmotic to seawater (like us) your cells shrivel up and die. Adaptive Properties of Hemoglobin Oxygen bind to iron atom in here group. One hemoglobin can bind 4 oxygens its affinity for oxygen increases once it gets one oxygen (cooperativity) sigmoid curve easily releases oxygen when it get to the tissues 100 90 80 70 60 50 40 30 20 10 90 80 70 60 50 40 30 20 10 Water blood
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The Bohr shift: The curve shifts down slightly at lower pH (in tissues, where co2 is being produced).
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