How many ATP are produced by NADH and FADH2 in the TCA cycle? Do they reside in the mitochondria beforehand?

I'm confused about what NADH and FADH2 are, and how they are produced in the first place. Then how they work in the TCA cycle throws me for a loop! My teacher is confusing, and is visually frustrated when I ask a further explanation. I would to understand, so I can rock his socks off with my know how!
1 answer 1