Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
FADH2 (Flavin Adenine Dinucleotide) is a high-energy molecule that stores energy for later use during cellular respiration, specifically in the electron transport chain.
A series of protein complexes and small organic molecules embedded in the inner mitochondrial membrane that transfers electrons from donors to acceptors via redox reactions, and couples this with the transfer of protons across a membrane.
Also known as citric acid cycle or TCA cycle, it's a series of chemical reactions used by all aerobic organisms to release stored energy through oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins into ATP and carbon dioxide.