Why do some redox reactions in cells result in the transfer of electrons from a reductant with a higher standard redox potential to an oxidant with a lower standard redox potential?

• Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions
• The rules governing oxidation and reduction apply only in vitro, and not in vivo
• Electrons always go from reductants with high redox potentials to oxidants with low redox potentials
• None of the above