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

C. M. Wood, G. Shelton

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)505-523
Number of pages19
JournalJournal of Experimental Biology
Volume63
Issue number2
StatePublished - Oct 1 1975

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science

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