Physiology and biochemistry in modern medicine . ch subject, one takenat the end of a normal inspiration and the other at the end of normalexpiration. The average of the two results is taken as the compositionof the alveolar air. On account of the difficulty in securing intelligent cooperation in theapplication of this method, particularly with children, others have beendeviled. One of the simplest is that of Fridericia, which is a modification of the Haldane-Priestley method, the apparatus for which is shownin the figure (Fig. 125), and the manipulation of which is outlined inthe legend. Anot
Physiology and biochemistry in modern medicine . ch subject, one takenat the end of a normal inspiration and the other at the end of normalexpiration. The average of the two results is taken as the compositionof the alveolar air. On account of the difficulty in securing intelligent cooperation in theapplication of this method, particularly with children, others have beendeviled. One of the simplest is that of Fridericia, which is a modification of the Haldane-Priestley method, the apparatus for which is shownin the figure (Fig. 125), and the manipulation of which is outlined inthe legend. Another is to take a mixed sample of the very last portionof several normal expirations. On account of the extended use which isbeing made of measurements of alveolar air composition, both in lab- *In place of the gas sampling tube it is much more convenient am! equally accurate to employ oneof the modern ground glass piston syringes (). The piston should, of course, be well smearedwith a good mineral grease. THE CONTROL OF THE RESPIRATION 341. 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^.
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectphysiology
