Fig. 1. Regression plot of percent of total systemic cardiac output (%_sys) directed to tissues perfused by the left subclavian and carotid arteries, as measured with ultrasonic flow probes (x axis) and the microsphere recovery technique (y axis). Values presented are from 5°C and 21°C acclimated turtles (N=7) during normoxic control, routine anoxia and following -adrenergic stimulation and blockade during anoxia.