cellular respiration part 2
Storyboard Text
- Step 4: Electron Transport Chain & Oxidative Phosphorylation
- A series of electron carriers and proteins are embedded in the inner mitochondrial membrane. Electrons donated by NADH and FADH2 are transported through this chain, providing energy for oxidative phosphorylation.
- Lets have a close look of how this happens inside of me!
- NADH donates 2 e and 1 H+ . FADH2 donates 2 e and 2 H+. The e are passed by e acceptors in the electron transport chain (ETC), while the H+ ions stay in the matrix . The movement of electrons through in the inner mitochondrial membrane pumps hydrogen out of the matrix and into the intermembrane space, creating a H+ gradient. Electrons continue along the ETC until they reach the final electron acceptor – oxygen. Each oxygen atom combines with 2 electrons and 2 Hs to form 1 molecule of H2O
- Through this process of oxidative phosphorylation oxygen acts as an electron acceptor and turns into water
- The diffusion of H+ gives the chemical energy to phosphorylate ADP and Pi into ATP. I just made 34 ATP in this step (10 NADH make 3 ATP each, 2 FADH2 make 2 ATP each.
- I just made 38 ATP using 1 Glucose! 2 in Glycolysis, 4 in Krebs Cycle (but I also use 2 here) and 34 in the ETC.
- Great work guys! Don't forget to start breaking down more glucose to make more ATP. Reuse leftover molecules like NAD at the beginning of the process.
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