1. Microcirculatory constriction phase venule H73 precapillary (A) terlovenou normal sphincter true capillary small vein true capillary precapillary MF arteriole sphincter pH7. 4 venule H7.1 precapillary B) (sphincter true capillary shunt smalI vein ischemic true capillary precapillary y anoxia phase H74 Sympathetic-adrenal system activation thoroughfare channel1. Microcirculatory constriction phase Sympathetic-adrenal system activation thoroughfare channel