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Cardiovascular responses to catecholamines at 12°C in the American bullfrog (Rana catesbeiana)

✍ Scribed by Herman, Ceil A. ;Robleto, Daniel O. ;Mata, Paula L. ;Heller, R. Scott

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
571 KB
Volume
240
Category
Article
ISSN
0022-104X

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✦ Synopsis

The effects of epinephrine, norepinephrine, phenylephrine, and isoproterenol on blood pressure and heart rate were studied in cannulated American bullfrogs, Rana catesbeiana. The bullfrogs were chronically cannulated with a T cannula in the right sciatic artery. In warm-acclimated (22°C) bullfrogs, preinjection mean systemic arterial pressure (SAP) prior to experimental treatment was 13.1 &-0.7 mm Hg. Reinjection heart rate was 34.8 rf: 1.8 beats per minute. These parameters were lower in cold-acclimated (12°C) bullfrogs. Cold-acclimated animals had mean SAP values of 8.2 0.3 mm Hg, and heart rate was 11.1 rt 1.1 beats per minute. Epinephrine, norepinephrine,

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