Aerobic respiration requires oxygen and produces a net yield of 36-38 ATP molecules per glucose molecule. This process takes place in the mitochondria of eukaryotic cells and involves four main stages:
1. Glycolysis: Glucose is broken down into pyruvate, producing a small amount of ATP.
2. Pyruvate oxidation: Pyruvate is converted into acetyl-CoA.
3. Krebs cycle: Acetyl-CoA is oxidized, generating electron carriers (NADH and FADH2).
4. Electron transport chain: Electrons are passed along a chain of proteins, releasing energy to pump protons across the mitochondrial membrane. This creates a proton gradient that drives ATP synthesis.
Anaerobic respiration does not require oxygen and produces only 2 ATP molecules per glucose molecule. This process occurs in the cytoplasm of cells and involves only glycolysis followed by fermentation, which regenerates NAD+ to allow glycolysis to continue.
Therefore, aerobic respiration is much more efficient at producing energy than anaerobic respiration.
