|
| |
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
Journal of Experimental Biology, Vol 87, Issue 1 247-270, Copyright © 1980 by Company of Biologists
JOURNAL ARTICLES |
CM Wood and G Shelton
Cardiac output and dorsal aorta, ventral aorta, caudal artery, caudal vein, and subintestinal vein pressures have been directly measured in intact unanaesthetized trout. Cardiac output (Q) averaged 36.7 ml/kg.min. The pressure drop across the systemic vascular resistance (Rs) was approximately twice that across the gill resistance (Rg), and a significant positive pressure persisted in the venous system. alpha-Adrenergic blockade revealed a considerable endogenous vasomotor tone resulting from latent adrenergic constriction of Rs. Intravenous adrenaline caused a pressor response throughout the circulatory system which has been analysed in detail with the aid of previous studies on isolated parts of the trout circulation. The complex and variable form of the pressor response reflected differential contributions from changes in Q, Rg, and Rs. Increases in Rs (alpha-receptor activation) were the principal cause of all pressor responses. Rg usually declined slightly due to passive dilation and/or beta-receptor stimulation, but occasionally increased due to alpha-receptor activation. The cardiac response reflected a varying balance between a direct beta-stimulatory effect of adrenaline on Q and an indirect passive inhibition of Q by the increase in peripheral resistance. Both effects were mediated through changes in stroke volume. Occasional tachycardia or more frequent reflex bradycardia were minor components of the cardiac response. The in vivo actions of other adrenergic agents have been similarly analysed.
This article has been cited by other articles:
|
|
 |
|
  L. Magnoni, E. Vaillancourt, and J.-M. Weber In vivo regulation of rainbow trout lipolysis by catecholamines J. Exp. Biol., August 1, 2008; 211(15): 2460 - 2466. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 X. Chen, T. W. Moon, K. R. Olson, R. A. Dombkowski, and S. F. Perry The effects of salt-induced hypertension on {alpha}1-adrenoreceptor expression and cardiovascular physiology in the rainbow trout (Oncorhynchus mykiss) Am J Physiol Regulatory Integrative Comp Physiol, September 1, 2007; 293(3): R1384 - R1392. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. B. Jensen and C. Agnisola Perfusion of the isolated trout heart coronary circulation with red blood cells: effects of oxygen supply and nitrite on coronary flow and myocardial oxygen consumption J. Exp. Biol., October 1, 2005; 208(19): 3665 - 3674. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Sandblom and M. Axelsson Baroreflex mediated control of heart rate and vascular capacitance in trout J. Exp. Biol., March 1, 2005; 208(5): 821 - 829. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Agnisola, L. Petersen, and T. Mustafa Effect of coronary perfusion on the basal performance, volume loading and oxygen consumption in the isolated resistance-headed heart of the trout Oncorhynchus mykiss J. Exp. Biol., November 15, 2003; 206(22): 4003 - 4010. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Perry, R Fritsche, T. Hoagland, D. Duff, and K. Olson The control of blood pressure during external hypercapnia in the rainbow trout (Oncorhynchus mykiss) J. Exp. Biol., January 8, 1999; 202(16): 2177 - 2190. [Abstract] [PDF]
|
|
|
|
|
|
N. Bernier, J. Mckendry, and S. Perry Blood pressure regulation during hypotension in two teleost species: differential involvement of the renin-angiotensin and adrenergic systems J. Exp. Biol., January 6, 1999; 202(12): 1677 - 1690. [Abstract]
|
|
|
|
|
|
N. Bernier and S. Perry Cardiovascular effects of angiotensin-II-mediated adrenaline release in rainbow trout Oncorhynchus mykiss J. Exp. Biol., January 1, 1999; 202(1): 55 - 66. [Abstract] [PDF]
|
|
