9-2, Part 1 Respiration

Overview of Respiration cellular respiration: the process that releases energy by breaking down molecules in food in the presence of O2 aerobic: processes that require oxygen 6O2 + C6H12O6  6CO2 + 6H2O oxygen + glucose  carbon dioxide + water pyruvic acid produced in cytoplasm goes into mitochondria where further energy is released for ATP

Electron Transport Chain Cellular Respiration Glucose (C6H1206) + Oxygen (02) Glycolysis Krebs Cycle Electron Transport Chain Carbon Dioxide (CO2) + Water (H2O)

Electron Transport Chain Mitochondrion Electrons carried in NADH Electrons carried in NADH and FADH2 Pyruvic acid Glucose Electron Transport Chain Krebs Cycle Glycolysis Mitochondrion Cytoplasm

The Krebs Cycle Also known as the citric acid cycle pyruvic acid broken down into carbon dioxide in a series of energy-extracting reactions (2 parts)

The Krebs Cycle Citric Acid Production Mitochondrion

The Krebs Cycle Energy extraction citric acid is broken down into other compounds releasing 2 molecules of carbon dioxide each turn of cycle forms 1 ATP from ADP each turn of cycle releases 5 pairs of electrons captured by 4 NADH and 1 FADH2 (FADH2 is similar to NADH)

The Krebs Cycle Citric Acid Production Mitochondrion

The Krebs Cycle Citric Acid Production Mitochondrion

Electron Transport Chain a series of carrier proteins located in the inner membrane of the mitochondrion, takes electrons from NADH and FADH2 from the other reactions used to convert ADP to ATP As the electron move they pump H+ across the membrane as H+ is diffuse back across the membrane from inside an ATP synthetase uses the energy to convert ADP to ATP each pair of electrons provides enough energy to produce 3 ATP molecules Requires oxygen

Electron Transport Chain Hydrogen Ion Movement Channel Mitochondrion ATP synthetase ATP Production

The Energy Totals How much total energy does a single molecule of glucose yield? glycolysis yields a net 2 ATP Krebs yields 2 ATP Electron transport yields 32 ATP the 36 ATP molecules represents 38% of the energy from glucose the remaining 62% is released as heat

Electron Transport Chain Mitochondrion Electrons carried in NADH Electrons carried in NADH and FADH2 Pyruvic acid Glucose Electron Transport Chain Krebs Cycle Glycolysis Mitochondrion Cytoplasm 2 ATP 2 ATP 32 ATP