Here's a breakdown of the main stages:
1. Glycolysis: This occurs in the cytoplasm and breaks down glucose into two molecules of pyruvate, producing a small amount of ATP and NADH (a high-energy electron carrier).
2. Krebs Cycle (Citric Acid Cycle): This occurs in the mitochondria and further breaks down pyruvate, producing more NADH, FADH2 (another electron carrier), and some ATP.
3. Electron Transport Chain: This also occurs in the mitochondria and uses the electrons from NADH and FADH2 to power a series of protein complexes that pump protons across the inner mitochondrial membrane. This creates a proton gradient that drives ATP production through oxidative phosphorylation. This is where the majority of ATP is generated.
In summary, cellular respiration is a complex process that involves multiple steps and produces a significant amount of ATP from glucose.
