The laws and mechanics of circulation, with the principle involved in animal movement . ced would depend upon the energy in therespiratory rhythms. Of course, the action in the portalvessels should be considered as in connection with this,while the increase of pressure in the parenchymatous tissuepromotes absorption, but increase in arterial pressure exertsno influence upon it (? enersich) ;* hence, rhythmical com- * Ludwigs Arbeiten, 1871, p. 53. PH SIOLOGICAL A1STAT0MY. 227 pression of the liver during respiration is essential for expedit-ing absorption in the liver for maintaining this in c
The laws and mechanics of circulation, with the principle involved in animal movement . ced would depend upon the energy in therespiratory rhythms. Of course, the action in the portalvessels should be considered as in connection with this,while the increase of pressure in the parenchymatous tissuepromotes absorption, but increase in arterial pressure exertsno influence upon it (? enersich) ;* hence, rhythmical com- * Ludwigs Arbeiten, 1871, p. 53. PH SIOLOGICAL A1STAT0MY. 227 pression of the liver during respiration is essential for expedit-ing absorption in the liver for maintaining this in corre-spondence with the absorptive processes in the intestines;otherwise impossible. In this manner, then, the portal circu-lation is maintained in correspondence with the absorptiveprocesses in the intestines and liver, the pressure produced bythe gases, together with the respiratory rhythms, acting uponboth alike for compelling this circumstance. In other words,the fluids in the parenchyma are pumped into their respectivechannels simultaneously with the fluids in the Pig. 85.—Transverse Section of a Single Hepatic Lobule. —Sappey. 1, Intra-lobular vein,cut across ; 2, 2, 2, 2, afferent branches of the intra-lobular vein ; 3, 3, 3, 3, 3, 3, 3,3, 3, inter-lobular branches of the portal vein, with its capillary branches, formingthe lobular plexus, extending to the radicles of the intra-lobular vein. Finally, to this mechanics must be added the action in theheart, the diastoles in the right side serving to aspirate thehepatic veins, at one and the same time that they aspirate thevenous system, the vessels also debouching in the cava close tothe heart, whereby an uninterrupted flow is maintained in theorgan, the same as in the lungs, but is not sufficient to make ituniform, the blood tending to accumulate during expiration ;and which affords opportunity for effecting metamorphosis,an amount of time being required for this purpose, which isalso in correspondence wi
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