Biology For Dummies
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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

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René Fester Kratz, PhD, teaches biology at Everett Community College. Kratz has a doctorate in botany from the University of Washington. She works with other scientists and K–12 teachers to develop science curricula that align with national learning standards and the latest research on human learning.

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