A text-book of physiology . m of the manometer and the tube t being completely filledalong its whole length with fluid to the exclusion of all air, the cannula c is filledwith fluid, slipped into the open end of the thick-walled india rubber tube i, until itmeets the tube t (whose position within the india rubber tube is she-\vn by the dottedlines), and is then securely fixed in this position by the clamp d. The stopcocks c and c are now opened, and the pressure-bottle raised or fluiddriven in by the syringe until the mercury in the manometer is raised to therequired height. The clamp c is the
A text-book of physiology . m of the manometer and the tube t being completely filledalong its whole length with fluid to the exclusion of all air, the cannula c is filledwith fluid, slipped into the open end of the thick-walled india rubber tube i, until itmeets the tube t (whose position within the india rubber tube is she-\vn by the dottedlines), and is then securely fixed in this position by the clamp d. The stopcocks c and c are now opened, and the pressure-bottle raised or fluiddriven in by the syringe until the mercury in the manometer is raised to therequired height. The clamp c is then closed and the forceps bd removed from theartery. The pressure of the blood in the carotid ca. is in consequence brought tobear through t upon the mercury in the manometer. If a float, swimming on the top of the mercury in the ascendinglimb of the manometer, and bearing a brush or other marker, bebrought to bear on a travelling surface, some such tracing as thatrepresented in Fig. 27 will be described. Each of the smaller. Fig. 27. Tracing op Arterial Pressure with a Mercury ManometeRo The smaller curves p p are the pulse-curves. The space from r to r embracesa respiratory undulation. The tracing is taken from a dog, and the irregularitiesvisible in it are those frequently met with in this animal. curves (p, p) corresponds to a heart beat, the rise corresponding tothe systole, and the fall to the diastole of the ventricle. The largerundulations (r, r) in the tracing, which are respiratory in origin,will be discussed hereafter. In Tig. 28 are given two tracingstaken from the carotid of a rabbit; in the lower curve the record-ing surface is travelling more rapidly than in the upper curve ;otherwise the curves are alike and repeat the general features ofthe curve from the dog. Chap, iv.] THE VASCULAR MECHANISM. 209 Tig. 28. Blood Pressure Curves from the Carotid of Rabbit, the TimeMarker in each case marking Seconds. Description of Experiment. Into a carotid, or other blood vess
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