The several metabolic pathways intersect at many points. This makes it quite convenient as there could be many sources of materials depending on which are needed and which are available. This is especially true when it comes to energy stores. Energy can be derived from carbohydrate sources, stored fat, or even muscle proteins.
Substrates that reoccur in several metabolic pathways form the metabolic pool. Study the figure below to place the items in proper order.
A. A is Pyruvate; B is Citric acid cycle; C is Electron Transport Chain
B. A is Electron transport chain; B is Pyruvate; C is Citric Acid cycle
C. A is Citric Acid Cycle; B is Electron Transport Chain; C is Pyruvate
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