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Cellular Respiration: Aerobic Respiration

Cellular Respiration: Aerobic Respiration. Krebs Cycle Electron Transport Chain and ATP Synthase. The Krebs Cycle. Occurs in the mitochondria. Produces high-energy molecules (NADH and FADH2), CO2 and 1 ATP Also called the citric acid cycle. Step 1.

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Cellular Respiration: Aerobic Respiration

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  1. Cellular Respiration: Aerobic Respiration Krebs Cycle Electron Transport Chain and ATP Synthase

  2. The Krebs Cycle • Occurs in the mitochondria. • Produces high-energy molecules (NADH and FADH2), CO2 and 1 ATP • Also called the citric acid cycle

  3. Step 1 • Pyruvic acid loses one carbon and two oxygen to form CO2 and Acetyl-CoA • During this step high energy molecule of NADH is formed

  4. Step 2 • Part of Acetyl-CoA combines with a 4-carbon compound to form citric acid • During this step two high energy molecules are formed: one FADH2 and one NADH

  5. Step 3 • Citric Acid loses one carbon and two oxygen to form CO2 and a 5-carbon compound • During this step a high energy molecule of NADH is formed

  6. Step 4 • The 5 carbon compound loses one carbon and two oxygen to form CO2 and a 4-carbon compound • During this step one high energy molecule of NADH is formed and one ATP is formed

  7. Overall Products of the Krebs Cycle • How many CO2 are formed? • How many NADH are formed? • How many FADH2 are formed? • How many ATP are formed?

  8. Electron Transport Chain • High energy electrons in NADH and FADH2 created during glycolysis and the Krebs cycle are used to pump H+ ions across the inner membrane of mitochondria to create a concentration gradient. • Oxygen acts as a final electron acceptor combining with low energy electrons and H+ ions to form H2O

  9. ATP Synthase • The push of H+ ions flowing down their concentration gradient through an enzyme called ATP Synthase converts ADP into ATP ADP ATP

  10. Total ATP formed from aerobic respiration from one molecule of glucose • 2 ATP from glycolysis • 4 ATP from the 2 NADH formed in glycolysis • 2 ATP from the Krebs cycle • 24 ATP from the 8 NADH formed from the Krebs cycle • 2 ATP from the 2 FADH2 formed from Krebs cycle

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