Asymmetrical permeability of the integument of tree frogs (Hylidae).

Thomas Yorio, P. J. Bentley

Research output: Contribution to journalArticleResearchpeer-review

30 Citations (Scopus)

Abstract

The skin from four species of North American tree frogs (Hylidae) was found in vitro, to be remarkably permeable to water in the presence or absence of the neurohypophysial hormone vasotocin. This property was, however, only seen in preparations from the ventral integument; osmotic water movement across the dorsal skin was negligible. The ionic permeability, reflected by the electrical resistance, was also much greater in the ventral skin. Unidirectional fluxes of 22Na, 36Cl, 14C-urea and tritiated water were measured in vitro in a single species, Agalychnis dacnicolor Cope. The ventral skin was 10-20 times more permeable to these molecules than the dorsal skin. The short-circuit current (usually reflecting active transmural Na transport) across the ventral skin was increased by aldosterone and vasotocin but these responses were absent on the dorsal side. The lipid content of the dorsal skin was four times greater than that on the ventral surface.

Original languageEnglish
Pages (from-to)197-204
Number of pages8
JournalJournal of Experimental Biology
Volume67
StatePublished - 1 Apr 1977

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Hylidae
integument
skin (animal)
frog
Anura
Permeability
skin
permeability
Skin
vasotocin
Vasotocin
Agalychnis
Posterior Pituitary Hormones
tritiated water
Water Movements
aldosterone
electrical resistance
Water
Aldosterone
Electric Impedance

Cite this

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Asymmetrical permeability of the integument of tree frogs (Hylidae). / Yorio, Thomas; Bentley, P. J.

In: Journal of Experimental Biology, Vol. 67, 01.04.1977, p. 197-204.

Research output: Contribution to journalArticleResearchpeer-review

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