Answer:
During cellular respiration, the first CO2 is generated during the process of pyruvate oxidation, and the remaining carbons are given off as CO2 during the citric acid cycle (also known as the Krebs cycle or tricarboxylic acid cycle).
i also mention these two breakdowns below
Step-by-step explanation:
Here's a breakdown of the two steps:
Pyruvate Oxidation: In the presence of oxygen, pyruvate, which is a product of glycolysis, enters the mitochondria. Inside the mitochondria, pyruvate undergoes a series of reactions known as pyruvate oxidation. During this process, each pyruvate molecule is converted into acetyl-CoA, releasing one molecule of CO2 as a byproduct. Acetyl-CoA then enters the citric acid cycle.
Citric Acid Cycle: Acetyl-CoA combines with a four-carbon molecule called oxaloacetate to form a six-carbon molecule known as citrate. The citric acid cycle is a series of enzyme-catalyzed reactions that occur in the mitochondria. During this cycle, carbon atoms from acetyl-CoA are gradually released as CO2 in multiple steps. For each turn of the citric acid cycle, two CO2 molecules are released. Since two acetyl-CoA molecules are generated from each glucose molecule (through glycolysis and pyruvate oxidation), a total of four CO2 molecules are released per glucose molecule during the citric acid cycle.
In summary, the first CO2 is generated during pyruvate oxidation when pyruvate is converted into acetyl-CoA. The remaining carbons are given off as CO2 during the citric acid cycle as acetyl-CoA is further metabolized.