. On disorders of digestion, their consequences and treatment . For if the ureter be tied so thatthe pressure of urine in the tubules is increased, the secretion isgreatly diminished, and even arrested, although the pressure ofblood in the renal artery be high. A somewhat similar effect to that of ligature of the ureter isproduced by ligature of the renal vein, for the blood accumulatingin the venous plexus surrounding the tubules compresses them soas to prevent the flow of urine through them. A similar conditionmay occur from cardiac or pulmonary disease obstructing the venouscirculation. 1 L
. On disorders of digestion, their consequences and treatment . For if the ureter be tied so thatthe pressure of urine in the tubules is increased, the secretion isgreatly diminished, and even arrested, although the pressure ofblood in the renal artery be high. A somewhat similar effect to that of ligature of the ureter isproduced by ligature of the renal vein, for the blood accumulatingin the venous plexus surrounding the tubules compresses them soas to prevent the flow of urine through them. A similar conditionmay occur from cardiac or pulmonary disease obstructing the venouscirculation. 1 Liulwig, Handwdrterluch d. Physiol., v. E. Wagner, Bd. 2. ^ Schweigger-Seidel, Die Nicrcn, p. 67 ; Heidenbain, HennannCs Handhuch , vol. v. Th. I. p. 293. FACTORS IN THE SECRETIOX OF URINE. 359 But unless in exceptional circumstances which alter the pressurewithin the tubules, such as compression of the tubules by con-gestion of the venous plexus, as in cardiac disease, impaction of acalculus in the ureter, or pressure on the ureters by dropsical. Aitcriae rcctae. VciifD rectae. Fig. 49.— Diagram of tlie tubules and vascular supply of the kidney. On the left isa tubule alone, in the middle is a tubule along wilh the blood-vessels, on the rightare blood-vessels only. accumulations or tumours, the rapidity of the secretion of urinedepends on two factors:—(1) arterial pressure in the glomeruli;and (2) the composition of the blood. The pressure of blood in the glomeruli may be raised—• (1) by increase of the arterial tension generally, (2) by increased tension locally. Thus the effect of cold winds and cold baths is probably duechiefly to their power of contracting the vesrcls in other parts ofthe body, and thus driving more blood into the renal artery, and 3G0 Oy THE ACTION AND USE OF DIURETICS. increasing tlie pressure in the glomeruli. In some pathologicalconditions also we find the blood pressure high, and the secretionof urine abundant. This occurs, as a ge
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