How does NADH, FADH2, and ATP contribute in respiration?

NADH- produced in glycolysis and Krebs Cycle feeds into the electron transport chain in the inner membranes of mitochondria and results in ATP synthesis.

FADH2- produced in Krebs Cycle feeds into the electron transport chain in the inner membranes of mitochondria and results in ATP synthesis.(oxidative phosphorylation)


ATP- one of the end products of respiration  = the universal energy currency.  Also used to "kick start" glycolysis.  Made in oxidative phosphorylation as well as substrate phosphorylation in glycolysis and Krebs.