What Is the Fuel Used in Respiration?

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The fuel used in cellular respiration is ATP, and two ATP are used in the first step of respiration, which is glycolysis. Learn about the protein gradient as a fuel for oxidative phosphorylation with help from a science teacher and field biologist in this free video on biology.

Part of the Video Series: Biology & Organic Chemistry
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Hi, I'm Brian with ericksontutoring.blogspot.com. Today we're going to discuss what fuels are used in cellular respiration. Cellular respiration is compose of three parts; but really it's important to know that it's extremely efficient process in terms of energy use, so fuel use. The first step of respiration is glycolysis and glycolysis requires two ATP in order to get jump started and get glucose to a point where it can be easily broken down. So that was two ATP for glycolysis. The Krebs cycle as far as I can tell doesn't actually use any fuel sources and oxidative phosphorylation or the electron transport chain doesn't require energy or fuel per se as well. It generates a proton gradient across the membranes in mitochondria and that proton gradient eventually dries, drives the production of ATP through an enzyme called ATP synthase. So you could kind of say that the protein gradient is a fuel for oxidative phosphorylation. This has been a brief discussion of the fuel use in cellular respiration.

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