WordReference Random House Unabridged Dictionary of American English © 2026
res′piratory chain′, [Biochem.]
  1. Biochemistrya series of mitochondrial proteins that transport electrons of hydrogen, released in the Krebs cycle, from acetyl coenzyme A to inhaled oxygen to form H2O: the energy released in the process is conserved as ATP. Cf. electron transport. 

'respiratory chain' also found in these entries (note: many are not synonyms or translations):
electron transport

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