A text-book of physiology, for medical students and physicians . on, but theamount of gas in solution is lessthan 1 volume per cent. Tensionsof gases in liquids are expressedeither in percentages of an atmos-phere or in millimeters of , the tension of oxygen in ar-terial blood is found to be equalto about 13 per cent, of an atmos-phere or 100 mms. Hg. (760 ).The Condition and Signifi-cance of the Nitrogen.—We mayaccept the view that the nitrogenof the blood is held in physicalsolution. The amount presentcorresponds willi this view, and,moreover, it is found thai thequantity va
A text-book of physiology, for medical students and physicians . on, but theamount of gas in solution is lessthan 1 volume per cent. Tensionsof gases in liquids are expressedeither in percentages of an atmos-phere or in millimeters of , the tension of oxygen in ar-terial blood is found to be equalto about 13 per cent, of an atmos-phere or 100 mms. Hg. (760 ).The Condition and Signifi-cance of the Nitrogen.—We mayaccept the view that the nitrogenof the blood is held in physicalsolution. The amount presentcorresponds willi this view, and,moreover, it is found thai thequantity varies directly with thepressure in accordance with thelaw given above. If an animalI permitted to breathe an atmosphere of oxygen and hydrogenthe nitrogen di appears from the blood, and when ordinary air isbreathed the nitrogen contents of the arterial and venous bloodsexhibit no constant difference in quantity. Ii seems certain, therefore, thai i lie nitrogen plays no direct role in the physiological pro-h i absorbed by the blood in proportion to its partial. 1iK- 200.—Diagram to show theprinciple of the aerotonometer: A, Thetube containing a known mixture ofeases, O, CO3, N; C, the outside jacketfor maintaining a con tan! hoily tem-perature. When topcook 6 1 openthe blood trickles down the side 01 Iand enters into lilTu ion relations withthe contained gs e , Aitei equilibriumis reached lie topcock u i closed anda i opened. By meane of the mer-cury liulli the ga e can then l- forced out of .1 into a uiiaUe receiver loranal. 1 CHANGES IN AIR AND BLOOD IN RESPIRATION. 655 pressure in the alveoli of the lungs and circulates in the blood insmall amounts without exerting any immediate influence upon thetissues. Condition of Oxygen in the Blood.—That the oxygen is notheld in the blood merely in solution is indicated, in the first place,by the large quantity present and, in the second place, by the factthat this quantity does not vary directly with the pressure in thesurrounding
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