Cellular Respiration &
Fermentation
Chapter 8
Cell RespirationAll organisms need energy from food. They obtain this energy through a process called cellular respiration.
Remember ATP!!
THERE ARE 2 TYPES OF RESPIRATION!
Anaerobic Respiration(Fermentation)
Uses NO OXYGEN and produces little energy from glucose – only 2ATPStarts with the process of GLYCOLYSIS in the CYTOPLASM C6H12O6 + 2 ATP 2 pyruvic acid + 4 ATP
(start up energy) (3-C Compound) (gain of 2 ATP)
Pyruvic Acid Breakdown in Some Organisms
Break it down into waste products to be excretedBacteria/Yeast – break it down into alcohol and CO2
Mammal Muscle Cells – turns into lactic acidBOTH PROCESSES MAKE 2 ATP in the ABSENCE of OXYGEN
PAUSE FOR A DEMONSTRATION!!
Aerobic RespirationRequires the presence of OxygenTakes place in the mitochondriaCOMPLETELY breaks down glucose molecule to generate large amounts of energy (36 ATP)
2 Processes Involved in Aerobic Respiration
Krebs (Citric Acid) CycleElectron Transport Chain
Steps:First, Glycolysis occurs (in the cytoplasm) generating 2 Pyruvic Acids and 2 ATPNext, Oxygen is used to completely breakdown the pyruvic acid and make CO2 and H2O as wastes and 34 more ATP
As you can see this is MUCH more efficient than anaerobic respiration, WHY?