The series of electron flow in the respiratory chain in the mitochondria membrane is-
NADH -------> Q --------> Cyt b ------> Cyt c1 --------> Cyt c -------> Cyt (a + a3) -------> O2
Complex I ; NADH dehydrogenase Complex Facilitated the electron transfer NADH to ubiquinone
Complex II; Succinate dehydrogenase Complex Facilitated the electron transfer succinate to ubiquinone
Complex III; Cytochrome bc1 complex or Ubiquinone: cytochrome c oxidoreductase Facilitated the electron transfer from ubiquinol to cytochrome c.
Complex VI; Cytochrome oxidase Facilitated the electron transfer from cytochrome c to O2.
In the electron transport chain, four protein complexes (designated complex I-IV) are involved in transporting electrons from NADH and FADH2 to molecular oxygen.
Complex I creates the hydrogen ion gradient by pumping four hydrogen ions from the matrix into the intermembranous region across the membrane.
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