. Advanced lessons in practical physiology for students of medicine. Physiology. 148 ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY area is attached a metal plate and ring, so that the membrane as a whole may be lowered and raised. The upper orifice of the bell-jar is closed by means of a rubber cork bearing a relatively narrow inlet tube. This chamber is traversed b}'- a horizontal tube of very soft rubber, draining a receptacle filled with water. Allow the water to flow steadily through this tube. Then lower the rubber membrane (diaphragm), thereby decreasing the pressure in the glass compartment
. Advanced lessons in practical physiology for students of medicine. Physiology. 148 ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY area is attached a metal plate and ring, so that the membrane as a whole may be lowered and raised. The upper orifice of the bell-jar is closed by means of a rubber cork bearing a relatively narrow inlet tube. This chamber is traversed b}'- a horizontal tube of very soft rubber, draining a receptacle filled with water. Allow the water to flow steadily through this tube. Then lower the rubber membrane (diaphragm), thereby decreasing the pressure in the glass compartment (intrathoracic pressure). Note that the "pul-. FiG. 92.—Device to Illustrate the Influence of the Respiratory Movements UPON THE Flow of the Blood through the Pulmonary Blood-vessels. (Hering.) A, Bell jar; B, rubber membrane closing it; V, soft-rubber pouch to imitate the pul- monary blood-vessels; GH, arrangement for forcing water through V under a constant pressure; j, manometer connected with "intrapleural ; On inspiration, pro- duced by moving the rubber membrane downward, the intrapleural pressure is decreased. This gives rise to an aspiration which tends to pull the wall of V outward, facilitating the flow from G to H. monary blood-bed," as represented by the thin rubber tube, is now large, allowing a free through flow. The opposite effect is produced by rais- ing the diaphragm. The caliber of the pulmonary blood-vessels is then (lccr(>ased and the pulmonary resistance increased. .5. Effect of Decreased Atmospheric Pressure.—Place a mouse under the bell-jar of an ordinary air-pump. Allow the pressure existing within this compartment to be recorded by means of a mercury manometer connected with the suction tube of the pump. Apply suction, lowering. 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 re
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysiology, bookyear1
