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The Ultrastructure of Frog Mesenteric Capillaries of Known Filtration Coefficient
Author(s) -
Mason J. C.,
Curry F. E.,
White Ingrid F.,
Michel C. C.
Publication year - 1979
Publication title -
quarterly journal of experimental physiology and cognate medical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0033-5541
DOI - 10.1113/expphysiol.1979.sp002474
Subject(s) - ultrastructure , filtration (mathematics) , anatomy , materials science , biology , chemistry , mathematics , statistics
The capillaries of the frog mesentery were investigated by transmission electronmicroscopy. The mean diameter of these vessels was 20µm and a single layer of five to six endothelial cells (on average) contributed to each circumference. Their ultrastructure was very similar to that of mammalian capillaries of the continuous type [Bennett, Luft and Hampton, 1959]. The endothelial cells, which contained many vesicles, were joined by specialized junctions and surrounded by a continuous basement membrane. Eleven capillaries were examined after the filtration coefficient of their walls had been investigated by the microperfusion micro‐occlusion technique of Michel, Mason, Curry and Tooke [1974]. No abnormal appearances were observed even after the vessels had been perfused with protein free solutions which have been shown to increase filtration coefficient five fold. No morphological differences between capillaries were seen to accompany large differences in the filtration coefficients.