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Cellular Respiration Food is used to energize ATP ATP MOLECULES The human body uses about 1 million molecules of ATP per cell per second. There are more than 100 trillion cells in the human body. That’s about 1 X 1020, or 100,000,000,000,000,000,000 ATP molecules, used in your body each second! Cellular Respiration Occurs in 3 stages: 1.Glycolysis 2.Kreb’s cycle 3.ETC 1. Glycolysis •Takes place in the cytoplasm NAD+ What’s Happened so far? Glycolysis glucose Glycolysis Glucose C O2 ATP NAD now Product: H Used # ? # What’s Happened so far? Glycolysis glucose Glycolysis O2 Used No Glucose C now Product: Pyruvate pyruvate pyruvate ATP NADH # # 2 2 Some energy captured as electrons •Energy in food in form of high energy electrons •Electrons captured when food is broken down •Held by electron carriers •NADH, FADH2 Pyruvate as a key juncture in catabolism 2. Krebs Cycle •Pyruvate broken down into CO2 Make • 2 ATP/ glucose •Electron carriers 3. Electron Transport Chain *H+ is pumped against its gradient *Energy for active transport comes from electrons Makes 34 ATP/ glucose! What is oxygen for? Receives electrons at the end of the ETC How many ATP are made per glucose during aerobic respiration? You need energy to think, to keep your heart beating, to play a sport, and to study this book. This energy is directly supplied by _____, which is (are) produced in the process of cellular respiration. 1. 2. 3. 4. 5. Enzymes ATP NAD+ vitamins proteins We need to breathe because we need 1. both atmospheric nitrogen and the oxygen for energy transformation 2. oxygen to act as a proton donor 3. nitrogen to donate phosphate groups to oxygen 4. oxygen to act as the final acceptor of electrons in the ETC 5. oxygen to donate phosphate groups to ADP, making it ATP Anaerobic Respiration Fermentation •Allows a cell to live off glycolysis alone Does anaerobic respiration require oxygen? Alcoholic Fermentation Pyruvate + NADH Ethanol + CO2(g) + NAD+ Lactic Acid Fermentation Pyruvate + NADH Lactic Acid + NAD+ When do your cells do anaerobic respiration? AN OVERVIEW OF CELLULAR RESPIRATION (LAYER 1) An overview of cellular respiration (Layer 2) An overview of cellular respiration (Layer 3) Comparing Photosynthesis and Respiration • In 1780, Joseph Priestley observed that green plants could restore "injured" or "depleted" air. Explain what was happening in this experiment. Process: Photosynthesis Organism: Plant Place Occurs: Chloroplast ATP CO2 and H2O Glucose and O2 Process: Respiration Organism: ALL Place occurs: Mitochondria