Biology CH 9.docx - 9.1 Cellular Respiration An Overview...

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9.1 Cellular Respiration: An Overview Chemical Energy and Food Where do organisms get energy?
Overview of Cellular Respiration What is cellular respiration? .
The cell has to release the chemical energy in food molecules (like glucose) gradually , otherwise most of the energy would be lost in the form of heat and light. Stages of Cellular Respiration 2.) During the Krebs cycle , a little more energy is generated from pyruvic acid. 3.) The electron transport chain produces the bulk of the energy in cellular respiration by using oxygen, a powerful electron acceptor. Oxygen and Energy Pathways of cellular respiration that require oxygen are called aerobic . The Krebs cycle and electron transport chain are both aerobic processes. Both processes take place inside the mitochondria .

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