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Fig. 3. Effects of bolus injections (2 and 10 µg kg-1) of adrenaline, phenylephrine and isoproterenol on haemodynamic variables in anaesthetised South American rattlesnakes Crotalus durissus: (A) tot, total cardiac output; (B) pul/sys, ratio of pulmonary cardiac output to systemic cardiac output; (C) VSsys, systemic stroke volume; (D) VStot, total stroke volume; (E) Rsys, systemic resistance; (F) Rven, venous resistance. Black bars represent control values. Grey bars represent values after injection of the various adrenergic agonists. Values are means ± S.E.M. (N=6). Asterisks indicate a significant difference relative to control values. (1 cm H2O=0.098 kPa.)





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