Describe the flow of NADH's electrons.
Answer: NADH gives two electrons to FMN, the electrons then travel through a series of iron-sulfur clusters to get to Coenzyme Q. Coenzyme Q accepts the two electrons (and in the process also takes up 2 protons from the matrix to become QH2). All this flow of electrons from NADH to Coenzyme Q is coupled to the pumping of 4 protons out.