Cellular Respiration: Energy Production in Cell
– Briefly explain the importance of energy for living organisms.
– Introduce the concept of cellular respiration as a process that converts nutrients into energy.
1. Overview of Cellular Respiration:
– Explain that cellular respiration is a series of metabolic reactions that occur within cells.
– Mention the three main stages: glycolysis, the citric acid cycle (Krebs cycle), and oxidative phosphorylation.
– Explain how glycolysis takes place in the cytoplasm of cells.
– Describe the breakdown of glucose into two molecules of pyruvate.
– Highlight the production of a small amount of ATP and NADH during glycolysis.
3. Citric Acid Cycle (Krebs Cycle):
– Detail the entry of pyruvate into the mitochondria.
– Explain how the citric acid cycle generates NADH, FADH2, and some ATP.
– Emphasize the role of the cycle in generating electron carriers and CO2 as waste.
4. Oxidative Phosphorylation:
– Describe how oxidative phosphorylation occurs in the inner mitochondrial membrane.
– Explain the electron transport chain (ETC) and its role in generating a proton gradient.
– Highlight the role of ATP synthase in generating ATP as protons flow back into the mitochondrial matrix.
5. ATP Production and Efficiency:
– Discuss the overall ATP yield from one glucose molecule during cellular respiration.
– Mention that the exact yield varies depending on conditions.
– Explain why cellular respiration is more efficient than fermentation in terms of ATP production.
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