The reason you breathe oxygen has nothing to do with your lungs. It's because your cells need somewhere to dump electrons — and without a final acceptor at the end of the chain, ATP synthesis stops within seconds and you die.
Your mitochondria run a biological transformer: four protein complexes pass high-energy electrons through redox centers like GPU layers in a forward pass, each releasing a small voltage drop to pump protons across a membrane. That gradient spins a molecular turbine — ATP synthase — producing the energy currency that every cell, LLM server included, ultimately traces back to.
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