The laws and mechanics of circulation, with the principle involved in animal movement . re. Italics are added It is needless to extend the matter, for we have seen that thelaw in the circulation and continuity in force alike call for thisnervous combination in the medulla oblongata for making res-piration and circulation a connected movement, in order tomaintain a balance between supply and demand in the cell- * Text Book of Physiology, pp. 385, 386. EHYTHMIC CENTRE FOE THE VESSELS 137 Ibrood, at once the object of all this arrangement, and that itcould not be done in any other way. But it is
The laws and mechanics of circulation, with the principle involved in animal movement . re. Italics are added It is needless to extend the matter, for we have seen that thelaw in the circulation and continuity in force alike call for thisnervous combination in the medulla oblongata for making res-piration and circulation a connected movement, in order tomaintain a balance between supply and demand in the cell- * Text Book of Physiology, pp. 385, 386. EHYTHMIC CENTRE FOE THE VESSELS 137 Ibrood, at once the object of all this arrangement, and that itcould not be done in any other way. But it is well to note,however, the physiological adjustment which obtains respect-ing it, for the venous blood itself, is the stimulus for increas-ing the action in the respiratory and vaso-motor centres,whereby venosity in the blood is rapidly reduced and the bal-ance once more restored when disturbed by defective respira- i ! i «! i Hi i f\ t i ?i ; ii \i i ft r. r- (\ r- !i • l i I in: • ! ! ,-. •/ J // \! \l ! / !/ * 1/ l i\i i -ii !if I1/ . I ! /I A ii WW i/ Ir W \ A ! i •! 7. Fig. 41.—Traubes Curves. To be read from left to right.—Foster. The curves 1, 2, 3,4, 5 were taken at intervals, and all form part of one experiment. Each curve isplaced in its proper position relative to the base line, which, to save space, is 1, artificial respiration was kept up, the undulations visible are therefore notdue to the mechanical action of the chest. When the artificial respiration was sus-pended these undulations for a while disappeared, and the blood-pressure rose steadilywhile the heart-beats became slower. Soon, as shown in curve 2, the undulationsreappeared. A little later, the blood-pressure was still rising, the heart-beats stillslower, but the undulations still obvious (curve 3). Still later (curve 4), the pressurewas still higher, but the heart-beats were quicker, and the undulations flatter. Thepressure then began to fall rapidly (curve 5), and continued to
Size: 2719px × 919px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
