Aerobic Respiration Chapter 9 sec. 2

Aerobic Respiration If oxygen is available, the pyruvic acid undergoes aerobic respiration

Aerobic Respiration Kreb’s cycle Electron Transport Chain

Mitochondria Matrix – space inside the inner membrane

Mitochondria Pyruvic acid from glycolysis diffuses into the mitochondria Matrix contains enzymes to catalyze the reactions

Mitochondra Enzymes convert pyruvic acid into Acetyl CoA (coenzyme A)

Krebs Cycle Biochemical pathway that breaks down acetyl CoA into CO2 and ATP

Hans Krebs

Electron Transport Chain 2nd stage of aerobic respiration Occurs in the cristae of the mitochondria

Electron Transport Chain Excited Electrons are passed down a series of molecules As they pass, they lose some energy

Electron Transport Chain The energy lost is used to pump protons across membrane This creates a concentration gradient of protons

Electron Transport Chain Concentration gradient drives the production of ATP

Role of Oxygen Last molecule of ETC has to unload its electrons on something O2 is the final electron acceptor forming H2O

Total Products Glycolysis = 2 ATP Krebs = 2 ATP and CO2 ETC = 32 ATP and water

Relationship 6H2O + 6CO2 ----------> C6H12O6+ 6O2