AUTONOMIC NERVOUS TONE AND REGULATION OF HEART-RATE IN THE GOLDFISH, CARASSIUS-AURATUS

被引:60
作者
CAMERON, JS
机构
[1] Department of Zoology, University of Massachusetts, Amherst
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-PHARMACOLOGY TOXICOLOGY & ENDOCRINOLOGY | 1979年 / 63卷 / 02期
关键词
D O I
10.1016/0306-4492(79)90084-4
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. Heart rate regulation in resting and exercising goldfish was investigated by pharmacological blockade of cardiac autonomic fibers in unrestrained goldfish. 2. In resting fish, atropine (1 mg/kg) elicits rapid rate increases averaging 110%; subsequent injection of propranolol (1 mg/kg), but not phentolamine (2 mg/kg), reduces heart rate. 3. Propranolol decreases heart rate and blocks the full atropine-induced increase, while phentolamine does not. 4. Calculated sympathetic tone (as % intrinsic heart rate) was 22% at 20-25°C; parasympathetic tone was 66%. 5. Enforced swimming (1.5 BL/sec) induces rapid cardioacceleration, which is abolished by propranolol. 6. Fluorescence histochemistry reveals adrenergic innervation of the muscular walls of all heart chambers. 7. An active role for the sympathetic nervous system in cardiovascular adjustments for exercise is suggested. © 1979.
引用
收藏
页码:341 / 349
页数:9
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