MUSCLE PHYSIOLOGY

Detailed explanation-1: -Two molecules of acetyl-CoA are produced from each glucose molecule so two turns of the Krebs cycle are required which yields four CO2, six NADH, two FADH2 and two ATPs.

Detailed explanation-2: -The Krebs cycle summarizes a circular series of reactions in the mitochondria to metabolize AcCoA to two molecules of CO2 with resultant generation of one molecule of GTP, three molecules of NADH, and one molecule of FADH2. GTP is equivalent to ATP in terms of energy charge.

Detailed explanation-3: -It also produces two carbon dioxide molecules per turn (one CO2 is produced when 1 of the 4 carbons in the citric acid molecule is oxidized). The cycle produces 3 hydrogen ions (H+) during each turn. So we can say that the net of each Krebs cycle products are: 3 NADH molecules.

Detailed explanation-4: -Products of the Citric Acid Cycle Each turn of the cycle forms three NADH molecules and one FADH2 molecule. These carriers will connect with the last portion of aerobic respiration to produce ATP molecules.

Detailed explanation-5: -So using this information, we can tally up the total amount of reduced NAD produced by one turn of the Krebs cycle. Our correct answer is three molecules of reduced NAD are produced.