The laws and mechanics of circulation, with the principle involved in animal movement . Animals.—Sappey. other hand, when the muscles expand, the low pressure thisproduces in the channel aspirates the lymph ; then anothercontraction followed by another expansion, and so the littlemechanism runs like a heart for pumping the lymph into thelymph-channels below. But to this we must add the force inthe muscular walls of the gut for compelling the fluidsinto the columnar epithelial cells through the sieve-like open-ings upon the free surface; thence through the memoranapropria (e, e, e) into the int
The laws and mechanics of circulation, with the principle involved in animal movement . Animals.—Sappey. other hand, when the muscles expand, the low pressure thisproduces in the channel aspirates the lymph ; then anothercontraction followed by another expansion, and so the littlemechanism runs like a heart for pumping the lymph into thelymph-channels below. But to this we must add the force inthe muscular walls of the gut for compelling the fluidsinto the columnar epithelial cells through the sieve-like open-ings upon the free surface; thence through the memoranapropria (e, e, e) into the interior of the villus, the high pres-sure it produces in the intestine, together with the actions in thevillus and the epithelia (for they are all connected by nervous MUSCLES TO LACTEALS. 255 force) compelling this circumstance. No wonder, then, thatfat or anything else absorbable should be rapidly there is no necessity for endowing any portion of themechanism with extraordinary powers in order to account forthe circumstance, such as that the epithelial cells act like. #? Tiff i Fig. 98.—Diagrammatic Section of a Villus.—Watney. ep, Epithelium only partiallyshaded in ; I, central chyle-vessel—the cells forming the vessel have been less shadedto distinguish them from the cells of the parenchyma of the villus ; m, muscle fibresrunning up by the side of the chyle-vessel. It will be noticed that each muscle fibreis surrounded by the reticulum, and by this reticulum the muscles are attached tothe cells forming the membrana propria, as at e, or to the reticulum of the , Lymph corpuscles, marked by a spherical nucleus and a clear zone of protoplasm ;I, upper limit of the chyle-vessel; e, e, e, cells forming the membrana propria. Itwill be seen that there is hardly any difference between the cells of the parenchyma,the endothelium of the upper part of the chyle-vessel, and the cells of the membranapropria, v, Blood-vessels ; z, dark hue at the base of the e
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Keywords: ., bookcentury1800, bookde, booksubjectblood, booksubjectrespiration
