During vigorous activity: ↑ skeletal muscle flow, ↓ gut & kidney flow (but kidney must remain fairly constant for waste removal → autoregulation mechanisms).
Piglet study: asleep vs. awake shows organ-specific redistribution; in piglets kidney flow unchanged whereas in adult humans it often decreases during sleep (species difference in developmental needs & thermoregulation).
Clinical & Real-World Connections
Glucosuria indicates PCT saturation → diagnostic for diabetes mellitus.