Fig. 1. A recording from an anaesthetised rattlesnake (Crotalus durissus, 754 g) of systemic arterial blood pressure (P_sys) as well as blood flows in the pulmonary artery (_PA) and the left aortic arch (LA_O) during a period of peripheral electrical stimulation of the left or right cervical vagus. The periods of electrical stimulation are shown by the right bars.