Acetyl coenzyme A (2-carbon), produced in the bridge, is fed into the Krebs cycle by reacting with oxaloacetate (4 carbon), producing citrate (6 carbon).
Each time a carbon is removed from one of the molecules in the cycle, a carbon dioxide is produced.
This happens at two different times when reducing the 6-carbon molecule to a 4-carbon molecule.
Products:
1 ATP
3 NADHs (produced at three different steps)
1 FADH2
Via Mr. Hammack's mad drawing skills
Energy at the End of the Krebs Cycle
One molecule of glucose is converted into the following by the end of the Krebs cycle:
From glycolysis
From the bridge
From the Krebs cycle
Total
ATP
2
0
2
4
NADH
2
2
6
10
FADH2
0
0
2
2
There Still is a Problem…
Most of the energy from the original glucose has not been converted into ATP.
It is in a form of energy the cell can't easily use—NADH and FADH2.