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Journal of Experimental Biology, Vol 63, Issue 2 505-523, Copyright © 1975 by Company of Biologists

JOURNAL ARTICLES

Physical and adrenergic factors affecting systemic vascular resistance in the rainbow trout: a comparison with branchial vascular resistance

CM Wood and G Shelton

The passive distensibility and adrenergic reactivity of the systemic vascular resistance (Rs) in Salmogairdneri have been studied using perfused trunk preparations, and the data compared with previous results on the branchial resistance (Rg). At normal levels of efferent blood pressure, Rs is relatively more distensible than Rg in response to afferent pressure increases, but this difference may not be important in vivo. alpha-adrenegic constrictory receptors predominate in Rs, in contrast to beta-adrenergic dilatory receptors in Rg; a significant alpha-adrenergic tone in Rs is lost during perfusion. Rs is far less sensitive than Rg to circulatory catecholamine levels. It is suggested that the sympathetic nervous system, rather than plasma catecholamines, provides the effective adrenergic control of Rs in vivo.


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© The Company of Biologists Ltd 1975