Krebs Cycle (College Board AP Biology)

• The Krebs cycle (sometimes called the citric acid cycle) consists of a series of enzyme-controlled reactions in the matrix of the mitochondria
• The process is as follows
  • 2 carbon (2C) Acetyl CoA enters the circular pathway from the end of first stage of pyruvate oxidation
  • The pathway releases carbon dioxide, ATP, NADH and FADH₂ from a series of organic intermediates
  • Finally the initial organic molecule is regenerated to allow the cycle to begin again
• The products of the Krebs cycle are then used as follows:
  • Carbon dioxide is released as a waste product
  • NADH and FADH₂ are transferred to the electron transport chain where they provide electrons to drive a series of REDOX reactions

The Krebs Cycle Diagram

The Krebs Cycle uses acetyl CoA from the oxidation of pyruvate to produce NADH, FADH₂ and ATP. CO₂ is lost as a waste product