Oxidative Phosphorylation

graph TD N1["NADH / FADH2 fuel"] N2["Complex I/II oxidize"] N3["Ubiquinone shuttle"] N4["Complex III -> cyt c"] N5["Complex IV reduces O2"] N6["Protons pumped out"] N7["Proton-motive force"] N8["ATP synthase rotates"] N9{"ADP available?"} N10["ATP synthesized"] N11["Backpressure slows ETC"] N1 --> N2 N2 --> N3 N3 --> N4 N4 --> N5 N2 --> N6 N4 --> N6 N5 --> N6 N6 --> N7 N7 --> N8 N8 --> N9 N9 -->|yes| N10 N9 -->|no ADP| N11 N11 -->|respiratory con…| N2 style N1 fill:#ff6b6b,color:#fff style N2 fill:#51cf66,color:#fff style N3 fill:#51cf66,color:#fff style N4 fill:#51cf66,color:#fff style N5 fill:#51cf66,color:#fff style N6 fill:#74c0fc,color:#fff style N7 fill:#74c0fc,color:#fff style N8 fill:#51cf66,color:#fff style N9 fill:#74c0fc,color:#fff style N10 fill:#b197fc,color:#fff style N11 fill:#51cf66,color:#fff