[VISUAL] In human cells a compound known as NADH is involved in a reaction that generates an electri — Electrochemistry Chemistry Question

[VISUAL]
In human cells a compound known as NADH is involved in a reaction that generates an electrical potential. The reaction is based on the two half-reactions shown in the table above. The balanced equation for the overall reaction is shown below.
O₂ + 2 H⁺ + 2 NADH → 2 H₂O + 2 NAD⁺