Metabolism

Metabolism

Cell Structure

Energy for Living

ATP and Energy

ATP and Energy

ATP and Muscles• ATP +HOH --> ADP + P + Energy• Relaxed muscle + energy --> contracted muscle

NAD+

ATP and Muscles

Oxidation of Ethanol with NAD+

FAD

FAD

Electron Transport

Electron Transport

Electron Transport

FMN similar to FAD

Electron Transport

Electron Transport

Cytochrome

Electron Transport

ATP Synthesis• 1.Electrons are transferred from NADH, through a series

of electron carriers, to O2.• 2.Transfer of electrons bycarriers generates a (H+)

gradient across the inner mitochondrial membrane.• 3. H+ diffuses back across the inner mitochondrial

membrane, ATP is synthesized.

How does ATP synthase work?

How does ATP synthase work?• Works like a rotar. Every time three protons are pumped through the channel, the F1 subunit rotates

120 degrees.

What happens at the end of electron transport?

• The overall electron chain transport reaction is: • 2 H+ + 2 e- + 1/2 O2 ---> H2O + energy

• Notice that 2 hydrogen ions, 2 electrons, and an oxygen

molecule react to form as a product, water with energy released in an exothermic reaction.