Aerobic respiration — glycolysis, the link reaction, the Krebs cycle and oxidative phosphorylation — plus anaerobic respiration and ATP.
Respiration releases energy from glucose to make ATP, the universal energy currency. ATP → ADP + Pᵢ releases a small, usable amount of energy for cellular work. Aerobic respiration has four stages.
1. Glycolysis (cytoplasm)
Glucose (6C) is phosphorylated (using 2 ATP) and split into two molecules of pyruvate (3C). This yields a net 2 ATP and 2 reduced NAD. Glycolysis needs no oxygen.
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