The resting heart rate was monitored in SO urethane-anaesthetized (387 ± 54 beats/min) and 4 conscious (341 ± 39 beats/min) ferrets. The arterial blood pressure in the anaesthetized animals was 140/110 ± 35/31 mmHg. The circulatory responses to vagal stimulation, carotid artery occlusion and a variety of humoral agents were examined. The vagal innervation of the heart and of the distribution of the great vessels are described.
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