Cellular Respiration &

Fermentation

Chapter 8

Cell Respiration

All 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 2ATP

Starts 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 excreted

Bacteria/Yeast – break it down into alcohol and CO2

Mammal Muscle Cells – turns into lactic acid

BOTH PROCESSES MAKE 2 ATP in the ABSENCE of OXYGEN

PAUSE FOR A DEMONSTRATION!!

Aerobic Respiration

Requires the presence of Oxygen

Takes place in the mitochondria

COMPLETELY breaks down glucose molecule to generate large amounts of energy (36 ATP)

2 Processes Involved in Aerobic Respiration

Krebs (Citric Acid) Cycle

Electron Transport Chain

Steps:

First, Glycolysis occurs (in the cytoplasm) generating 2 Pyruvic Acids and 2 ATP

Next, 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?