. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. delivering its blood at once tothe renal vein, forms a plexus on the sides of a urinifer-ous tube. It is supposed that the exudation of the wa-ter of the urine takes place in the Malpighian body, andthe secretion of the solid portions from the cells cover-ing the uriniferous tubes. The chief feature of this structure is, therefore, thatin a sac formed upon a uriniferous tube, a tuft of capil-laries, the walls of which are of extreme tenuity, permitswater to e
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. delivering its blood at once tothe renal vein, forms a plexus on the sides of a urinifer-ous tube. It is supposed that the exudation of the wa-ter of the urine takes place in the Malpighian body, andthe secretion of the solid portions from the cells cover-ing the uriniferous tubes. The chief feature of this structure is, therefore, thatin a sac formed upon a uriniferous tube, a tuft of capil-laries, the walls of which are of extreme tenuity, permitswater to escape from the blood supplied by the emul-gent artery. The blood, thus concentrated by loss ofits water, passes into the veinlets originating in the in-terior of the tuft; these, converging into a little trunk,less in diameter than the twig of the emulgent artery,escape along with that vessel from the capsule; but, in-stead of discharging its contents into the renal vein, it Describe the course followed by the urinary secretion. What isthe constitution of the Malpighian bodies ? Describe the course ofthe circulation in the MALPIGHIAN CIRCULATION—THE UEINE. 193 ramifies in a plexus on the walls of a uriniferous tube,thus affording a miniature representation of the portalvein, beginning in a capillary sys-tem and ending in one. Fromthe plexus the commencing capil-laries of the renal veins arise. Mr. Bowmans explanation ofthe Malpighian circulation is rep-resented in Fig. 10. a, branchof renal artery; of, afferent ves-sels ; m m, Malpighian tufts; efef, efferent vessels ; p, their plex-us upon the uriniferous tube; st,straight tube; ct, convoluted tube. The urine of man is a clear, am-ber-yellow liquid, the average spe-cific gravity of which may be tak-en at , giving an acid reac- Diagram of Malpighian circu- tion when first voided, but graclu- latlon- ally becoming alkaline and turbid. Its composition va-ries greatly with preceding states of the system, and thenat
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Keywords: ., bookautho, bookcentury1800, bookdecade1860, booksubjectphysiology
