Cellular respiration is your body's way of breaking down food molecules (carbohydrates, proteins, and fats) and making their stored energy available to the cell. Here's a brief overview:

Phase Location in Eukaryotic Cell? Molecules That Enter? Molecules Produced? Links to Other Phases?
Glycolysis Cytoplasm Glucose, 2 NAD+, 2 ADP + P 2 pyruvate, Net 2 ATP, 2 NADH + H+ Pyruvate to linking step; NADH to ETC
Linking step (pyruvate oxidation) Matrix of mitochondrion 2 pyruvate, 2NAD+ 2 NADH + H+, 2 CO2, 2 acetyl-coA NADH to ETC, acetyl-coA to Krebs
Krebs Cycle Matrix of mitochondrion 2 Acetyl-coA, 6 NAD+, 2 FAD 6 NADH + H+, 2 FADH2, 2 ATP, 4 CO2 NADH to ETC, FADH2 to ETC
Electron Transport Chain (ETC) Inner membrane of mitochondrion NADH, FADH2, ADP + P 3 ATP per NADH, 2 ATP per FADH2 NAD+ to glycolysis, linking step & Krebs, FAD to Krebs