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. Thats about 1 X 10 20, 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.Krebs cycle 3.ETC 1. Glycolysis Takes place in the cytoplasm NAD+ Whats Happened so far? Glycolysis O 2 Used ? Glucose C now Product: ATP # NAD H # Glycolysis glucose Whats Happened so far? Glycolysis O 2 Used Glucose C now Product: ATP # NADH # GlycolysisNoPyruvate22 pyruvate glucose 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, FADH 2 Pyruvate as a key juncture in catabolism 2. Krebs Cycle Pyruvate broken down into CO 2 Make 2 ATP/ glucose Electron carriers *H+ is pumped against its gradient *Energy for active transport comes from electrons 3. Electron Transport Chain 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? 1.Enzymes 2.ATP 3.NAD + 4.vitamins 5.proteins 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.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 We need to breathe because we need Anaerobic Respiration Fermentation Allows a cell to live off glycolysis alone Does anaerobic respiration require oxygen? Alcoholic Fermentation Pyruvate + NADH Ethanol + CO 2 (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 Glucose and O 2 Process: Respiration Organism: ALL Place occurs: Mitochondria CO 2 and H 2 O ATP