So in summary we've looked at the first two phases of
cellular respiration. The first of which was glycolysis.
And we learned that it's important to do the accounting.
We're tracking our original 6 carbons that we had
in the glucose molecule. And so by the end of
glycolysis, we have split it into two 3 carbon pyruvates.
In addition, we yielded a couple of ATP.
We invested 2. We got 4 out. We have 2 nett ATP.
And we put some of the energy from our original 6
carbons when we split them into the NAD
electron carriers. So we are taking those guys to the
main event and we are going to see what happens to them
later. In pyruvate oxidation, the second phase, we're
really trying to accomplish recycling of electron carriers.
So we are taking our 2 pyruvates and we will cut off
1 carbon dioxide from each of them and so we yield
2 carbon dioxides as well as being left with 2 carbon
molecules. 2 of them that are called Acetyl-CoA.
And we have loaded up a couple more electron cars
so that we can take the kids off to the dance.
Now, notice here in pyruvate oxidation there is no ATP
produced. So it's the only phase in which we'll have
zero physical ATP produced. But we do have all this
electron energy being carried off to the main event
where we're going to see the oxidative phosphorylation.
So in this lecture, we have learned about
glycolysis as well as pyruvate oxidation. So you
should be able to describe both of those processes.
As well as calculate the energy yields or the
major players, those three molecules,
you should know what happens in each phase with those.
In addition you should be able to distinguish
between aerobic and anaerobic respiration.
And describe the purpose of pyruvate oxidation.
Thank you so much for listening. I look forward to
covering the next two phases with you
in the next lecture.