Cellular Respiration Study Note.pdf - Key Steps(ETC The...

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Key Steps (ETC): The first complex in the ETC is NADH reductase. NADH gets converted to NAD+ and H+. There are several electron carriers plus a molecule of ubiquinone (also known as Q). As the electrons are passed through the complex, the H+ from NADH is moved to the intermembrane space. Each pair of electrons from NADH pulls 3 pairs of H+ ions to the intermembrane space. This results in the production of 3 ATP. Complex II involves cytochromes which have iron in the centre of the heme group. It also receives a molecule of FADH2 from the Krebs Cycle. Once again electrons are passed to the next more electronegative carrier and the protons (H+) move to the intermembrane space. Each pair of electrons from FADH2 pulls 2 pairs of H+ ions into the intermembrane space, resulting in 2 ATP. Complex III involves more cytochromes, such as cytochrome c1, cytochrome b1, cytochrome c.

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