Both the conversion of pyruvate to acetyl CoA and the citric acid cycle produce CO2. Carbon dioxide (CO2) is a product of both types of reactions.
During the conversion of pyruvate (also called pyruvic acid) to acetyl CoA, each pyruvate loses one atom of carbon (C) and releases CO2 (carbon dioxide).
The chemical reactions involved in the breakdown of pyruvate are used by cells to produce energy in the form of ATP.
The citric acid cycle (also called the Krebs cycle) is the second stage of cellular respiration
This cycle (citric acid cycle) produces two molecules of CO2, one molecule of ATP, and reduced forms of NADH and FADH2.
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