Lung surface NADH (top panel), FAD (middle panel), and mitochondrial redox ratio (bottom panel) signals for (a) baseline followed by lung perfusion with Rotenone, (b) baseline followed by perfusion with potassium cyanide (KCN), (c) baseline followed by lung perfusion with pentachlorophenol (PCP). For each measurement (NADH, FAD and RR) the signal was normalized to the average signal under baseline (control perfusate) conditions.