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The Krebs cycle is the first of two stages of a process called cellular respiration, in which glucose is transformed into a usable form of chemical energy called adenosine triphosphate, or ATP. Although cellular respiration is a relatively complicated process, involving dozens of steps, its chemical equation is quite simple. It begins with the raw materials glucose and oxygen and yields carbon dioxide and water (both waste products) and free energy, some of which is captured and stored in usable form as ATP. The chemical equation for this conversion is C6H12O6 + 6 O2 ---> 6 CO2 + 6 H2O + energy (ATP).

This process cannot begin without glucose, a simple sugar molecule made up of 6 atoms each of carbon and oxygen and 12 atoms of hydrogen. However, all of us consume many types of food besides glucose. In fact, glucose is relatively uncommon in our diets. Over the course of a typical day, most people consume a combination of carbohydrates, fats, and proteins.

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12y ago

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