Explain the rational why oxygen does not participate directly in the krebs cycle , but operates only when oxygen is present.
Answers
Answer:
The Krebs cycle does not use oxygen, though it does stop in the absence of oxygen because it runs out of NAD and FAD. ... This use of fatty acids by the Krebs cycle generates CO2, a small amount of ATP, and the electron carrier molecules NADH and FADH just as use of pyruvate does.
Answer:
If oxygen is present, pyruvate from glycolysis is sent to the mitochondria. The pyruvate is transported across the two mitochondrial membranes to the space inside, which is called the mitochondrial matrix. There it is converted to many different carbohydrates by a series of enzymes. This process is called the Krebs cycle. The Krebs cycle consumes pyruvate and produces three things: carbon dioxide, a small amount of ATP, and two kinds of reductant molecules called NADH and FADH.
The CO2 produced by the Krebs cycle is the same CO2 that you exhale. The electron carriers NADH and FADH are sent to the final step of cell respiration, which is respiratory electron transport. The Krebs cycle does not use oxygen, though it does stop in the absence of oxygen because it runs out of NAD and FAD.
Many of your body's cells can also use fatty acids in the Krebs cycle. Fatty acids are the major components of fats. When fats are being used to make ATP, fatty acids are released into the blood by fat cells, taken up by other cells, sent to the mitochondria, and consumed by the Krebs cycle. This use of fatty acids by the Krebs cycle generates CO2, a small amount of ATP, and the electron carrier molecules NADH and FADH just as use of pyruvate does