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Transportation of respiratory gases
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| Submitted: Thu Jul 11 2002
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Transportation of respiratory gases Transport of oxygen 98% of the oxygen that is transported from the lungs to the requiring tissues travels within our red blood cells, carried by haemoglobin. Globular protein, Quaternary structure Iron Each HAEM group can bind 1 oxygen molecule (O2) Therefore a haemoglobin molecule can exist in a number of forms: i. Hb4 0% (saturation) ii. Hb4O2 25% iv. Hb404 50% v. Hb4O6 75% vi. Hb4O8 100% ie. The Hb molecule can combine with a different numbers of O2 molecules. Oxygen dissociation curve for Hb. Saturation Of Hb (%) p.O2 ( mm.Hg) p.O2 =partial pressure of oxygen . mm.Hg = scale Hg= mercury The graph describes the behaviour of the haemoglobin molecule in the way it binds with oxygen in different environment. 1- Haemoglobin in red blood cells is exposed too a high pp of oxygen ( around 100mm of mercury).The graph shows that Hb molecules here will be fully saturated. 2- Red blood cells containing saturated Hb now travel in circulation until eventually exposed to...
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