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Just Breathe… Biology 11/30/10 Energy • What sources of energy do we know? • Food • NADPH • ADP • ATP Energy • Why is Energy important? • Metabolism! • Catabolism: releases energy by splitting complex molecules into smaller components. • Anabolism: synthesis of complex molecules from simpler building blocks. Energy • How is energy measured? • Calorie • 1 calorie is the amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius. Energy • How do we get to that energy? • Cellular Respiration! • The controlled process that releases energy from food in the presence of oxygen Cellular Respiration • In the presence of O2, glucose is broken down and rearranged to form carbon dioxide, water and energy. 6O2 + C6H12O6 ---> 6CO2 + 6H2O + energy Cellular Respiration • • • • Aerobic Respiration NEEDS OXYGEN!!! Most eukaryotes and prokaryotes Nutrients are catabolized to carbon dioxide and water. • 4 stages of aerobic respiration Aerobic Respiration • • • • 1. Glycolysis (in cytosol) 2. Formation of acetyl CoA (in mito) 3. Citric Acid/ Krebs Cycle (in mito) 4. Electron Transport and chemiosmosis (in mito) It’s the most wonderful time of the year! Christmas...