. Human physiology. od of different animals is found to differ greatly in the rela-tive quantity of the red corpuscles it contains, the number seeming tobear a pretty exact ratio with the temperature of the animal. Thehigher the natural temperature, the greater the proportion of corpus-cles; arterial always containing a much greater proportion than ve-nous blood. In the greater part of the mammalia they have the sameshape as those of man; but their size varies greatly iu different fami-lies. It would appear, from the researches of Mandl, that of themammalia the elephant has the largest, (y^fit
. Human physiology. od of different animals is found to differ greatly in the rela-tive quantity of the red corpuscles it contains, the number seeming tobear a pretty exact ratio with the temperature of the animal. Thehigher the natural temperature, the greater the proportion of corpus-cles; arterial always containing a much greater proportion than ve-nous blood. In the greater part of the mammalia they have the sameshape as those of man; but their size varies greatly iu different fami-lies. It would appear, from the researches of Mandl, that of themammalia the elephant has the largest, (y^fith of a millimetre,) andthe ruminantia the smallest; that the family of camels is the only one,whose corpuscles are not round like those of the other mammalia, but Manuel dAnatomie Generale, p. 248, Paris, 1843. For numerous admeasurementsof the red corpuscles of the blood of man and animals, see Note by Mr. Gulliver toHewsons Works, Sydenham Societys edit., p. 237, Lond., 184(i. BLOOD—RED CORPUSCLES. 363 Fig. elliptical like those of birds, reptiles, and fishes,^ In all oviparousvertebrata, without any known ex-ception, the red corpuscles are oval. The chemical constitution of theblood corpuscles is not definitelysettled. Two proximate principleshave been discovered in them—hematin or hematosiyi, and ghlm-lin,—hemaioglohulin of Simon. Theformer, as mentioned hereafter, isthe colouring matter. The latter,which differs from the globulinof Laennec, — an impure hematinmingled with some albumen,—isthe main constituent of the globules,and is the same as the hlood-caseinof Simon. It has not been separated; but is presumed to differ butlittle in its properties from protein. It has been supposed that the red corpuscles are formed originallyin the germinal membrane of the embryo: but, throughout the re-mainder of existence, in the blood from the chyle. Their origin is,however, by no means settled. Normally, they are not found outsidethe vessels ; and are manifestly, there
Size: 2167px × 1153px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthordungliso, bookcentury1800, bookdecade1850, bookyear1856
