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{ Posts neetguide : BIOLOGY Cheuwsursitive bodi + Apreustic Cente Prenustasur Centre 274 Nervous fORG Carotid Aostid Boch 17.4 TRANSPORT OF GASES F DRG Dorsal Respiratory group Blood is the medium of transport for 0, and CO,. About 97 per cent of O, is transported by RBCs in the blood. The remaining 3 per cent of O, is carried in a dissolved state through the plasma. Nearly 20-25 per cent of CO, is transported by RBCs whereas 70 per cent of it is carried as bicarbonate. About 7 per cent of Co, is carried in a dissolved state through plasma. Keundu Corbarminohaemogobin 17.4.1 Transport of Oxygen Haemoglobin is a red coloured iron containing pigment present in the RBCs. O, can bind with haemoglobin in a reversible manner to form oxyhaemoglobin Each haemoglobin molecule can carry a máximum of four molecules of O. Binding of oxygen with haemoglobin is primarily related to partial pressure of Oz. Partial pressure of CO,. hydrogen ion concentration and temperature are the other factors which can interfere with this binding. A sigmoid curve is obtained when percentage saturation of haemoglobin with O, is plotted against the pog. This curve is called the Oxygen dissociation curve (Figure 17.5) and is highly useful in studying the effect of factors like pCo.,,H* concentration, etc., pn binding of O, with haemoglobin. In the alveoli, where there is high po,, low pCO, lesser H concentration VR G. veutres Respiratory group lobin with oxygen 29 100 ...
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