Physiology and biochemistry in modern medicine . Fig. -FriiU-ricias apparatus for measuring the COs in alveolar air. The person expiresforcibly through the tube with the stopcocks as in I. A is closed and the tube placed in water tocool the air, after which B is turned as in II. The entrapped column of air equals 100 Asolution of caustic alkali is now sucked into C with stopcocks as in II. B is then turned as inI but with A still closed, and the alkali solution allowed to enter b, after which B is turned oft,the excess of alkali solution in C allowed to run out and the burette shake
Physiology and biochemistry in modern medicine . Fig. -FriiU-ricias apparatus for measuring the COs in alveolar air. The person expiresforcibly through the tube with the stopcocks as in I. A is closed and the tube placed in water tocool the air, after which B is turned as in II. The entrapped column of air equals 100 Asolution of caustic alkali is now sucked into C with stopcocks as in II. B is then turned as inI but with A still closed, and the alkali solution allowed to enter b, after which B is turned oft,the excess of alkali solution in C allowed to run out and the burette shaken. The burette isthen submersed up to a in a cylinder of water, with B as in III. After allowing for cooling,the level at which the water stands gives the per cent of CO^.. iH-7 % o2 in inspiredair (30 to 20 30 W Fig. 126.—Curves to show the relationship between the 02 and COa tensions in alveolar air(dotted lines) and arterial blood (continuous lines). It will be observed that the tension of C02in blood is slightly above that in alveolar air, but that the reverse relationship obtains for 02. Inthe upper part of the curve the 02 tension in the alveolar air was experimentally altered, causinga corresponding alteration in the 62 tension of the blood. This result is of practical significancein connection with 02 alterations in gas poisoning, pneumonia, etc. (From A. and M. KroghJ 342 THE RESPIRATION oratory and in clinical work, a special chapter has been devoted to thesubject, giving in detail the more recent methods devised by R. G. Pearce. Lastly, it should be noted that several observers believe that a morereliable estimate of the alveolar tension of C02 (and of 02) can be madeby analyzing a sample of ordinary expired air and calculating the per-centa
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