1. Glycolysis: This is the first stage of cellular respiration, and it occurs in the cytoplasm of the cell. During glycolysis, one molecule of glucose is broken down into two molecules of pyruvate. This process also results in the generation of ATP, NADH, and FADH2.

2. Krebs cycle (citric acid cycle): This occurs in the matrix of the mitochondria, and it involves a series of nine chemical reactions. During the Krebs cycle, the pyruvate molecules from glycolysis are further broken down into carbon dioxide and ATP. This process also results in the generation of NADH, FADH2, and GTP.

3. Oxidative phosphorylation: This occurs in the inner membrane of the mitochondria, and it involves a series of four complexes. During oxidative phosphorylation, the NADH and FADH2 molecules from glycolysis and the Krebs cycle are used to generate ATP. This process also results in the production of water.