gen-state-the-citric-acid-tca-cycle-precisely-and-explain-why-it-fc84

State the citric acid (TCA) cycle precisely and explain why it matters in 2-3 sentences.

# The TCA Cycle **Precise sequence:** Acetyl-CoA + Oxaloacetate → Citrate → Isocitrate → α-Ketoglutarate → Succinyl-CoA → Succinate → Fumarate → Malate → Oxaloacetate (regenerated) **Products per cycle:** 3 NADH, 1 FADH₂, 1 GTP/ATP, 2 CO₂ **Why it matters:** The TCA cycle is the central metabolic hub that completely oxidizes acetyl-CoA from carbohydrates, fats, and proteins to CO₂, while capturing energy in reduced electron carriers (NADH, FADH₂) that drive ATP production via oxidative phosphorylation. It also provides essential biosynthetic precursors for amino acids, nucleotides, and heme, making it critical for both energy generation and cellular building blocks.