Morphologic features of the adaptation of vessels of the renal glomerular complex of Testudo horsfeldi Gr. and Columba livia
Valishin, E.S.
Arkhiv Anatomii Gistologii i Embriologii 89(12): 60-67
1985
ISSN/ISBN: 0004-1947 PMID: 4091684 Document Number: 242434
Morphological characteristics on adaptive abilities of the glomerular complex vessels in kidneys of 35 tortoises (Testudo horsfieldi) is presented under conditions of experimental alimentary dehydration and in intact kidneys of 29 pigeons (Columba livia). Appearance of transversal and circular anastomoses between the afferent and efferent arterioles of the glomeruli, as well as transformation of their capillaries into nutritional capillaries in the tortoise kidneys under the alimentary dehydration ensures realization of the periglomerular and aglomerular renal arterial blood circulation. These rearrangements, resulting in maximal water preservation in the organism under conditions of its obvious deficit, ensure vital activity of the animals at the expense of the secretory and readsorption processes, which predominate in the kidneys of the lower vertebrates. In the intact kidneys of the pigeon, the "spring-like" glomeruli of the capillaries are revealed for the first time; together with their urine-forming function it is worthwhile to consider them as damping mechanisms capable to reduce hydrodynamic stroke of blood.