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Hemoglobin and Oxygen Transport

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O2 transport   oxygen is transported in blood in two ways:  dissolved in plasma (only 1.5% because O2 is poorly soluble in plasma)  bound to hemoglobin inside RBCs (98.5% is carried this way)  
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Hemoglobin   hemoglobin (Hb) is a protein composed of 4 polypeptide chain subunits  each subunit is bound to an iron-containing heme group  since iron ions serve as oxygen-binding sites, each hemoglobin can rapidly and reversibly bind 4 oxygen molecules  
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Hemoglobin II   a hemoglobin molecule bound with oxygen is called oxyhemoglobin (HbO2)  a hemoglobin molecule that has released its oxygen is called deoxyhemoglobin (HHb)  
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Hemoglobin and Oxygen Transport   when the first oxygen molecule binds the first iron molecule, the hemoglobin changes shape and the affinity for the other 3 oxygen molecules progressively increases  
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Hemoglobin and Oxygen Transport II   similarly, when the first oxygen is unloaded, the affinity for oxygen is decreased and it becomes progressively easier for the other 3 oxygen molecules to dissociate from the hemoglobin  
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Hemoglobin and Oxygen Transport III    hemoglobin is fully saturated when all four heme groups are bound to oxygen  if fewer than all four heme groups are bound, the hemoglobin is said to be partially saturated  
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