Electron Transport Chain (ETC) and Chemiosmosis

00:01 Previously, you've learned about the first two phases of cell respiration with glycolysis and pyruvate oxidation.

00:09 Now, it's time to dig in a little deeper and look at the Krebs cycle and electron transport chain that's paired with chemiosmosis.

00:18 This is where the real energy yields happen.

00:21 So in this lecture, we will continue our tracking of carbon as well as electron carriers, and ATP production.

00:31 So by the end of it, you should be able to diagram where each of these come from in the whole process of cellular respiration as well as where they go.

00:40 For example, electron carriers end up going to the electron transport chain.

00:45 Also, you should be able to describe how the electron or the gradient is created during the electron transport chain and explain how ATP is produced in the process of chemiosmosis.

00:59 We also have chemiosmosis.

01:02 So hydrogen ions were forced out into the intermembrane space, creating a high concentration of hydrogen ions.

01:10 Then they rush back through the ATP synthase down the concentration gradient.

01:16 This way ATP is being made.

01:19 Previously, we covered glycolysis and pyruvate oxidation.

01:23 Now, it's time to move into the Krebs cycle and electron transport chain.

01:27 We've already produced some full electron carriers with their hydrogens and electrons.

01:33 And now in the Krebs cycle, we are going to produce even more electron carriers.

01:38 We have NADs picking up hydrogens and electrons to become NADH plus an extra H.

01:44 And then we have a new player which is FADH, which will actually become FADH2.

01:52 So FAD to FADH2 another electron carrier works in just the same way as NAD so don't get in a panic about it.

02:02 The point here is they will transport electrons to the electron transport chain and that is where we'll see generation of piles and piles of ATP.

02:11 The major energy yielding phase of cellular respiration.