What is the Electron Transport Chain (ETC)?

The electron transport chain is a process that occurs in the inner membrane of mitochondria. It involves the transport of electrons through 4 complexes in the membrane, which provides energy for the transfer of H+ ions (coming from reduced NAD and reduced FAD made in aerobic respiration) into the intermembranous space. These H+ ions then diffuse down the electrochemical membrane back into the mitochondrial matrix through ATP Synthase, which uses this movement to drive ATP synthesis. Oxygen is the final electron acceptor, removing electrons and Hions so that the ETC may start again. Overall, 32 ATP molecules are generated, and for every two electrons and two H+ ions a molecule of water is made using half an O2 molecule.

AJ
Answered by Adam J. Biology tutor

5797 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Compare and contrast stabilising selection with disruptive selection


What is osmosis


Describe the process by which Tissue Fluid is formed


Describe Gaseous exchange in the alveoli of the lungs


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning