. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. 64 D. V. Bates and R. V. Christie Lastly, is tlierc any change in the abihty of the inspired air to make proper contact with the pulmonary blood? It nii^ht seem that the obvious way to settle this point would be to analyse the arterial blood and find out just what has happened to the blood as it passed through the lungs. To do this with any accuracy it is not enough to measure the Og saturation of the arterial blood; both the alveolar and arterial YOUNG. 80 60 emphysema) 40 20 20 40 60 ao /i"*^*&qu
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. 64 D. V. Bates and R. V. Christie Lastly, is tlierc any change in the abihty of the inspired air to make proper contact with the pulmonary blood? It nii^ht seem that the obvious way to settle this point would be to analyse the arterial blood and find out just what has happened to the blood as it passed through the lungs. To do this with any accuracy it is not enough to measure the Og saturation of the arterial blood; both the alveolar and arterial YOUNG. 80 60 emphysema) 40 20 20 40 60 ao /i"*^*" MEAN " 31 sot 6-4 NO 72 % <J 20 40 60 80 Fig. 7. The percentage of CO removed from the hispired air when breathing 0-1 per cent CO in air is shown on the al)seissa. O2 tensions have to be measured, the technique of which is difficult and laborious. More straightforward is the use of carbon monoxide. As you all know, haemoglobin has a great affinity for carbon monoxide. In fact if a healthy individual breathes a low concentration of CO most of the gas which reaches the alveoli will be taken up by the blood (Bates, 1952). The expired air will therefore contain very much less CO than was inspired. If, however, some of the inspired air were wasted in ventilating avascular areas a very different result might be expected. In these bloodless areas the CO would not be ab- sorbed and therefore the concentration of CO in tlie expired. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward). Boston, Little, Brown
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