. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. ough the pulmonary vein the red blood is returned to the heart. 492. As the impure blood is passing in the minute vessel?over the air-cells, the oxygen passes through the thin coats ofthe air-cells and blood-vessels, and unites with the blood. A*the same time, the carbonic acid and waler leave the blood,and pass through the coats of the blood-vesccls and air-cells,and mix with the air in the cells. These ar^; Uiownoutof the,system every time we breathe. This inteiCiiaAjre o^ productsproduces the ch
. A treatise on anatomy, physiology and hygiene : designed for colleges, academies and families. ough the pulmonary vein the red blood is returned to the heart. 492. As the impure blood is passing in the minute vessel?over the air-cells, the oxygen passes through the thin coats ofthe air-cells and blood-vessels, and unites with the blood. A*the same time, the carbonic acid and waler leave the blood,and pass through the coats of the blood-vesccls and air-cells,and mix with the air in the cells. These ar^; Uiownoutof the,system every time we breathe. This inteiCiiaAjre o^ productsproduces the change in the color of the hiccf. Explain fig. 98. 492. How and wjiere is th t-tT-^ eh*»iiged ? 16 ANATOMY, PHYSIOLOGY, AND HYGIENE. Experiment. Fill a bladder with dark blood drawn fromajiy animal. Tie the bladder closely, and suspend it in theair. In a few hours, the blood next the membrane will havebecome of a bright red color. This is owing to the oxygenfrom the air passing through the bladder, and uniting withthe blood, while the carbonic acid has escaped through the membrane. Fig. 99. 3. Ffg. 99. An ideal view of the pulmonary circulation. 1, 1, The right , 2, The left lung. 3, The tracljea. 4, The riglit bronchial tube. 5, The leftbronchial tube. 6, C, 6, C, Air-cells. 7, The right auricle. 8, The right , The tricuspid valves. 10, The pulmonary artery. II, The branch to the lightlung. 12, Tlie branch to thfi left lung. 13, The right pulmonary vein. 14, Theleft pulmonary vein. 15, The left auricia 16, The left ventricle. 17, Themitral 493. The presence of carbonic acid tind watery vapor inthe expired air, can be proved by the following experiments: Give the experiment showing that oxygen changes the dark-coloredblood to a bright red color. Wbat is represented by fig. 99 ? 493. How canthe praeojio* of carbonit aeid Ui the luBgs b« proved ? ^PHYSIOLOGY OF THE RESPIRATORY ORGANS. 227 . 1st. Breathe into lime-water, and in a few minutes it willbecome
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