Cellular Respiration

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Slide 1

Cellular Respiration

Aerobic and Anaerobic Metabolism

Slide 2

Glycolysis takes place in the cytoplasm

Slide 3

Glycolysis Simplified (greatly )

If oxygen is available (aerobic), then pyruvate enters the Krebs cycle

If oxygen is not available(anaerobic), then pyruvate undergoes fermentation

Slide 4

Aerobic respiration

Slide 5

Synonymous Terms

Krebs cycle

Citric acid cycle

Tri-carboxylic acid cycle (TCA cycle)

Slide 6

Mitochondrial Structure

The Krebs cycle takes place across inner membrane space (matrix) of the mitochondrion

Slide 7

ElectronTransport

Slide 8

The Role of Oxygen (O2)

Oxygen is the terminal (final) electron acceptor

½ O2 + 2H+ + 2e-  H2O

 Oxygen is needed only in the very LAST step of cellular respiration!

Slide 9

Mitochondrial Structure

Infoldings (cristae) increase the area of membrane surface available for electron transport

Slide 10

Aerobic Respiration

C6H12O6 + 6O2 → 6CO2 + 6H2O + 38 ATP

The Krebs cycle and electron transport take place in the mitochondria

The Krebs cycle and electron transport maximize ATP yield

38 ATP vs. 2 ATP for fermentation

Slide 11

Anaerobic Respiration

(Alcohol Fermentation)

C6H12O6 → 2 CH3CH2OH + 2 CO2 + 2 ATP

glucose ethyl alcohol carbon

dioxide

Alcohol fermentation takes place in yeast

and some bacteria, and yields only the

2 ATP produced in glycolysis

Slide 12

Anaerobic Respiration

(Lactic Acid Fermentation)

C6H12O6 → 2 C3H6O3 + 2 ATP

glucose lactic acid

Lactic acid fermentation takes place in

animal cells and some bacteria and fungi;

it yields only the 2 ATP produced in glycolysis.