. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 528 PHYSIOLOGY OF THE DOMESTIC ANIMALS. To avoid this loss of blood, it is therefore advisable to inject the sodium carbo- nate solution into the tube of "the manometer until the column of mercury has been elevated to the height which will probably correspond to that of the mean arterial pressure. Comparative experiments made in the above-described manner will show that the blood pressure is considerably higher in the arteries than in the veins, and greater in the large arteries than in the arterial b
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 528 PHYSIOLOGY OF THE DOMESTIC ANIMALS. To avoid this loss of blood, it is therefore advisable to inject the sodium carbo- nate solution into the tube of "the manometer until the column of mercury has been elevated to the height which will probably correspond to that of the mean arterial pressure. Comparative experiments made in the above-described manner will show that the blood pressure is considerably higher in the arteries than in the veins, and greater in the large arteries than in the arterial branches (Fig. 221) ; so, also, the pressure may be demonstrated to be higher in the small veins than in the large veins at their opening into the heart. Experiment will further show that in the veins the pressure is almost constant, overlooking the insignificant variations which are due to respiration ; so, also, the pressure will be found to be almost constant in. Fig. 219.—Ludwio's Kymographion, after Hermann. (Yeo.) The ordinary form of rotating, blackened cylinder (R), which is moved by the clock-work in the box (A) by means of the disk (D) pressing on the wheel (n), which can be raised or lowered by the screw (L) so as to rub on a part of the disk more or less near the centre, and thus rotate at dinerent rates. The cylinder may be raised by the screw (o) which is turned by the handle (U). the small arteries, while in the large arteries considerable variations, corresponding in their increase to the systole and their decrease to the diastole, are invariably found. It is evident that the mean between the maximum and minimum pressures in the arteries, as indicated by these oscillations, will represent the force which is concerned in the propul- sion of the blood. Although theoretically and practically the pressure decreases as the distance increases from the heart, yet in any artery which is not too small to be subjected to such manometrical experiments it will be found tha
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