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FADH2 in the Electron Transport Chain?

Human Anatomy, Physiology, and Medicine. Anything human!

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FADH2 in the Electron Transport Chain?

Postby natasha88 » Tue May 07, 2013 4:59 am

Hi guys,

I'm finally getting my head wrapped around Cellular Respiration (with many thanks to Khan Academy!).

In the Electron Transport Chain, it's my understanding that NADH is oxidised, losing its electrons to the reduction of O to H20. In doing so, it changes to a lower energy state and the excess energy is used to pump protons from the matrix of the mitochondria to the outer membrane of the mitochondria.

What I don't understand is what happens to FADH2. Is it exactly the same process, just with a smaller number of ATPs being produced?

Would it be correct to say that, as with the NADH, the FADH2 is oxidised, loses its electrons, comes to a lower energy state and the excess energy is used to move the protons from the matrix to the outer membrane of the mitochondria?

If the oxidation of NADH produced NAD+, H+ & 2e-, would the oxidation of FADH2 produce FAD, H+ & 2e-?

Sorry if this seems like a silly question! So many thanks to anyone who answers :)
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Postby JackBean » Fri May 10, 2013 4:00 pm

You're probably not learning the detailed version, are you?

If it contains 2 hydrogens, it must release 2 H+, so FADH2 -> FAD + 2H+ + 2e-
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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