OXIDATIVE PHOSPHORYLATION

Cards (1)

  • 5.2 RESPIRATION- OXIDATIVE PHOSPHORYLATION
    • This uses the 1 reduced FAD and 3 reduced NAD from the Krebbs cycle
    • This makes LOTS of ATP
    • It involves an electron transport chain and chemiosmosis (bit like in the Calvin cycle)
    • Oxidation of the reduced FAD and NAD means that FAD and NAD lose hydrogen. This hydrogen splits into H+ and protons and electrons
    • The electrons move down the ETC and lose energy as they do
    • This energy is used to pump protons into the intermembrane space from the mitochondrial matrix to form an electrochemical gradient- HIGHER IN SPACE THAN IN MATRIX
    • Protons move back into the matrix due to the gradient via ATP synthase- which phosphorylates ADP to ATP of course
    • The process pf ATP production is driven by protons ( remember the H+ ions) moving across a membrane due to movement of electrons- THIS IS CHEMIOSMOTIC THEORY!
    • Finally at the end of the transport chain protons and electrons combine with oxygen from the blood to form water
    • OXYGEN IS CONSIDERED TO BE THE FINAL EL