Does cellular respiration result in a net input of energy or a net output of energy? Explain.

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Cellular respiration results in a net output of energy. During cellular respiration, glucose and oxygen are used to produce carbon dioxide, water, and energy in the form of adenosine triphosphate (ATP), which is the usable energy currency in cells. ATP is produced through a series of reactions in the mitochondria of cells, specifically through the processes of glycolysis, the Krebs cycle, and oxidative phosphorylation (electron transport chain).

Although ATP is generated through cellular respiration, it is important to note that the process requires an initial input of energy in the form of glucose and oxygen. However, the total energy released during cellular respiration is greater than the energy initially invested. This overall energy gain is due to the breakdown of glucose molecules into smaller components, releasing stored chemical energy.

In summary, cellular respiration leads to a net output of energy in the form of ATP, as the energy released during the process exceeds the energy initially invested.
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