ETS : Electron Transport System | Quick Bytes | Dr Sarita Kothari Bio Excel Nagpur.

Quick Revision and explanation of ETS Electron Transport System in Biology NEET
ETS Electron Transport System NEET, Electron Transport System NEET Biology, NEET Preparation, Electron Transport System, Quickly understand ETS Electron Transport System, Antibody Types, Dr Sarita Kotharis Bio Excel, Electron Transport System (ETS) in Plants - Diagram and Explanation
The Electron Transport System in plants is part of the light-dependent reactions of photosynthesis. It occurs in the thylakoid membrane of the chloroplasts.
ETS Electron Transport System
Oxidative phosphorylation is the final stage of aerobic cellular respiration, occurring in the inner mitochondrial membrane, where electron transport chain (ETC) reactions drive ATP synthesis. NADH and
deliver electrons to four protein complexes, creating a proton gradient that powers ATP synthase to produce 26–28 ATP per glucose.

Key Aspects of Electron Transport and Oxidative Phosphorylation:
Location: The entire process takes place in the inner mitochondrial membrane.
Electron Transport Chain (ETC): A series of redox reactions where electrons are transferred from carriers (NADH, ) through complexes I–IV, ultimately reducing
Proton Gradient (Chemiosmosis): As electrons move through the complexes, protons (
are pumped from the mitochondrial matrix into the intermembrane space, creating an electrochemical gradient.
ATP Synthesis: The high concentration of protons causes them to flow back into the matrix through ATP synthase (Complex V), providing energy to synthesize ATP from ADP and inorganic phosphate
Energy Yield: NADH oxidation pumps 10 protons (yielding ~2.5 ATP), while
pumps 6 protons (yielding ~1.5 ATP).
Components of the ETC:
Complex I (NADH dehydrogenase): Accepts electrons from NADH.
Complex II (Succinate dehydrogenase): Accepts electrons from
Complex III (Cytochrome c reductase): Accepts electrons from Coenzyme Q.
Complex IV (Cytochrome c oxidase): Final complex; reduces
Coenzyme Q and Cytochrome c: Mobile electron carriers.

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