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11 Cards in this Set
- Front
- Back
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Annelids
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annelids are fond of respiratory pigments. thye live in low O2 environments and need lots of pigments.
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Phylogenetic Distribution of Respiratory pigments
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conclusions: hemoglobins are very old molecules
annelids have many resp. pigments. |
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hemoglobin
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4 heme groups (2 alpha, 2 beta). each heme group has iron molecule in its center.
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Difference between oxyhemoglobin and deoxyhemoglobin?
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OXY--> red, HbO2
DEOXY--> blue, Hb |
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Predecessors of Hemoglobin
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Probably served a diferent function other than O2 transport. Know this b/c some organisms have hemoglobin that don't need it, function may have been electron transport
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allosteric effect
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the bonding of one O2 molecule effects the ability of the molecule to accept more O2. hard to seek polypeptides w/out O2, but once O2 is present it's eaier to load more O2
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Bohr Effect
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-more H+ pushes towards an unloading curve (% saturation of O2 decreases)
-less H+ pushes towards a loading curve |
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myoglobin
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myoglobin is a resevoir of O2 in the muscle so it's reluctant to give off O2. increased % saturation of O2. shifted towards loading curve.
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Hemoglobin S
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sickle-cell anemia....polymerizes when it gives up O2 -- causes cell to sickle. prone to giving up O2. shifted toward an unloading curve.
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How is CO2 carried in the blood?
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70% bicarbonate ions
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Super Nitric Oxide -- the newest function of hemoglobin
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Hemoglobin picks up super NO (NO w/ an extra electron). Hemoglobin relases O2 and superNO at the tissues. superNO causes vasodilation of blood vessels to increase the amound of oxygen-carrying blood to that tissue.
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