LESSON 3:CELLULAR RESPIRATION
Introduction:
Cellular respiration is how cells get energy from glucose.
Aerobic respiration (with oxygen) glucose is broken down into pyruvic acid, which enters the mitochondria. In the Krebs cycle and electron
transport chain, pyruvic acid is turned into carbon dioxide and water. This process releases a lot of ATP (energy).
Anaerobic respiration (without oxygen) pyruvic acid is changed into lactic acid. This only makes 2 ATP per glucose, much less energy.
In Cellular Respiration:
Three stages of cellular respiration:
Glycolysis: This process occurs in the cytoplasm and breaks down glucose into pyruvate.
Citric Acid Cycle (Krebs Cycle): This stage takes place in the mitochondrial matrix and processes pyruvate to produce electron carriers.
Oxidative Phosphorylation: This final stage occurs on the inner mitochondrial membrane and uses the electron transport chain to produce ATP.
