MUSCLE PHYSIOLOGY

Detailed explanation-1: -In each of the enzymatic reactions, NAD+ accepts two electrons and a H+ from ethanol to form NADH.

Detailed explanation-2: -Electrons from NADH enter the electron transport chain in complex I, which consists of nearly 40 polypeptide chains (Figure 10.8). These electrons are initially transferred from NADH to flavin mononucleotide and then, through an iron-sulfur carrier, to coenzyme Q-an energy-yielding process with G°´ =-16.6 kcal/mol.

Detailed explanation-3: -NAD+ is the oxidized form of the molecule; NADH is the reduced form of the molecule after it has accepted two electrons and a proton (which together are the equivalent of a hydrogen atom with an extra electron).