Antidiuretic responses to osmotic cutaneous stimulation in the toad, Bufo arenarum. A possible adaptive control mechanism for urine production

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
S PetriellaE T Segura

Abstract

Osmotic stimulation of the skin of the toad Bufo arenarum with isotonic (115 mM) or hypertonic (400 mM) NaCl solutions produced a marked and reversible antidiuresis within 5 min. No changes in plasma osmolarity were detected in the course of this response. Hypophysectomized animals exhibited a lower and delayed antidiuresis when exposed to a hypertonic environment (400 mM NaCl). This antidiuretic response was drastically reduced in normal toads after ten consecutive days of administration of the sympatoplexic guanethidine. The existence of a feed-forward control of urine production initiated by cutaneous osmotic sensors and involving an adrenergic component is proposed.

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Citations

Feb 1, 1992·Comparative Biochemistry and Physiology. Comparative Physiology·U SinschN Sherif
Jan 1, 1993·Comparative Biochemistry and Physiology. Comparative Physiology·C B Jørgensen

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