The Three Stages of Aerobic Respiration: Glycolysis, Citric Acid Cycle, and Electron Transport Chain

Rank the 3 groups of reactions of aerobic respiration in the order they occur, beginning with the first stage of cellular respiration at the top.

1. glycolysis2. Krebs cycle3. Electron transport train

The three groups of reactions in aerobic respiration occur in the following order:

1. Glycolysis: Glycolysis is the first stage of cellular respiration that occurs in the cytoplasm of the cell. In this process, glucose is converted into two molecules of pyruvate. Glycolysis is an anaerobic process, meaning it does not require oxygen.

2. Citric Acid Cycle or Krebs Cycle: The second stage of aerobic respiration occurs in the mitochondria of the cell. In the citric acid cycle, pyruvate is further broken down and oxidized, releasing carbon dioxide as a waste product. The energy released in this stage is used to produce ATP, a form of energy that can be used by the cell for various metabolic processes.

3. Electron Transport Chain: The third and final stage of aerobic respiration also occurs in the mitochondria of the cell. In the electron transport chain, the electrons produced from the first two stages of respiration are utilized to drive a series of chemical reactions that produce even more ATP. The energy produced in this stage is used to power various processes in the cell, including muscle contraction, nerve impulses, and the synthesis of new molecules.

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