Abstract
1. During a 2 min period of submersion of normal ducks, sciatic artery blood flow fell to 10 +/- 1.5% control and carotid artery blood flow was reduced to 71 +/- 7% control. Mean arterial blood pressure (M.A.P.), however, was maintained at 83 +/- 3.5% of control. The whole animal showed a constrictor response during submersion, with the sciatic vascular bed showing average constriction. Both resistance to flow and yield pressure increased in the sciatic bed but changed little in the carotid bed. After 1 min submersion P(a,O2) was 52 +/- 1 mm Hg.2. Upon emersion, as soon as ventilation commenced, the whole animal showed a dilator response. The carotid bed exhibited marked vasodilatation whereas the sciatic bed returned to its control level.3. After alpha-receptor blockade, ducks were submerged for 1 min. During this time M.A.P. fell to 64 +/- 5.6% of control and heart rate was reduced to 49 +/- 8.3% of control. Blood flow through the sciatic and carotid arteries also fell to values of 41 +/- 6.9% of control and 91 +/- 13% of control respectively. There was little change in either resistance to flow or yield pressure in the sciatic bed compared to normal ducks, and the carotid bed showed reductions in resistance to flow and yield...Continue Reading
Citations
Jan 1, 1980·Comparative Biochemistry and Physiology. C: Comparative Pharmacology·B A Gooden
Nov 1, 1974·Electroencephalography and Clinical Neurophysiology·J M Verlander, S E Huggins
Feb 1, 1974·Acta Physiologica Scandinavica·H T Andersen, A S Blix
Jul 1, 1983·Respiration Physiology·P J Butler, E W Taylor
Oct 1, 1974·Respiration Physiology·O S Bamford, D R Jones
Nov 1, 1973·Respiration Physiology·P J Butler, E W Taylor
Oct 1, 1990·General and Comparative Endocrinology·A M Lacombe, D R Jones
Feb 1, 1980·British Journal of Pharmacology·B A Gooden
Dec 1, 1980·Acta Physiologica Scandinavica·C Bech, K Johansen
Jan 1, 1988·Annals of the New York Academy of Sciences·P Johnson
Jul 9, 2002·Journal of Basic and Clinical Physiology and Pharmacology·E OphirJ Marder
Nov 1, 1974·Zentralblatt für Veterinärmedizin. Reihe A·M Szabuniewicz, J D McCrady
Nov 1, 1978·British Journal of Pharmacology·C J Dix, V C Jordan
Dec 12, 2003·The Journal of Experimental Biology·J A W StecykT Wang
Mar 20, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·G P OllenbergerN H West
Mar 1, 1972·Comparative Biochemistry and Physiology. A, Comparative Physiology·D R Jones, G F Holeton
Oct 1, 1973·Comparative Biochemistry and Physiology. A, Comparative Physiology·R W MillardW K Milsom