Number of shuttles for transportion extra mimtochondrial `NADH_(2)` into mitochondrial is

In an electron transport chain one molecule of NADH_(2) yields

In an electron transport chain one molecule of NADH_(2) yields

Assertion: The inner membrane of mitochondria contains systems involving electron transport. Reason: The mitochondrial matrix contains enzymes of Kreb's cycle.

Electron transport system (ETS) is located in mitochondrial

The oxidation of one NADH_(2) yields

The oxidation of one NADH_(2) yields

At which step of respiration, hydrogen of NADH_(2) is used ?