Chapter 9 - Cellular respiration: harvesting chemical energy. After studying this chapter you will be able to: Explain in general terms how redox reactions are involved in energy exchanges; name the three stages of cellular respiration, for each, state the region of the eukaryotic cell where it occurs and the products that result; in general terms, explain the role of the electron transport chain in cellular respiration;. | Chapter 9 Cellular Respiration: Harvesting Chemical Energy Overview: Life Is Work Living cells require energy from outside sources. Some animals, such as the giant panda, obtain energy by eating plants, and some animals feed on other organisms that eat plants. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings For the Discovery Video Space Plants, go to Animation and Video Files. Energy flows into an ecosystem as sunlight and leaves as heat. Photosynthesis generates O2 and organic molecules C-H-O, which are used in cellular respiration. Cells use chemical energy stored in organic molecules C-H-O to regenerate ATP, which powers work. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Energy Flow and Chemical Recycling in Ecosystems IN: Light Energy ECOSYSTEM Photosynthesis in chloroplasts CO2 + H2O Cellular respiration in mitochondria Organic Molecules + O2 ATP powers most cellular work OUT: Heat energy ATP Figure Catabolic pathways yield energy by oxidizing organic fuels: C-H-O molecules to Produce ATP The breakdown of organic molecules is exergonic. Fermentation is a partial degradation of sugars that occurs without O2 Aerobic respiration consumes organic molecules and O2 and yields ATP. Anaerobic respiration is similar to aerobic respiration but consumes compounds without O2 Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Cellular respiration includes both aerobic and anaerobic respiration but is often used to refer to aerobic respiration. Although carbohydrates, fats, and proteins are all consumed as fuel, it is helpful to trace cellular respiration with the sugar glucose: C6H12O6 + 6 O2 6 CO2 + 6 H2O + Energy (ATP + heat) Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Redox Reactions: Oxidation and Reduction Oxidation is a LOSS (of H or electrons). Reduction is a GAIN (of H or electrons). The transfer | Chapter 9 Cellular Respiration: Harvesting Chemical Energy Overview: Life Is Work Living cells require energy from outside sources. Some animals, such as the giant panda, obtain energy by eating plants, and some animals feed on other organisms that eat plants. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings For the Discovery Video Space Plants, go to Animation and Video Files. Energy flows into an ecosystem as sunlight and leaves as heat. Photosynthesis generates O2 and organic molecules C-H-O, which are used in cellular respiration. Cells use chemical energy stored in organic molecules C-H-O to regenerate ATP, which powers work. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Energy Flow and Chemical Recycling in Ecosystems IN: Light Energy ECOSYSTEM Photosynthesis in chloroplasts CO2 + H2O Cellular respiration in mitochondria Organic Molecules + O2 ATP powers most cellular work OUT: Heat energy ATP
