The citric acid (Krebs’) cycleसिट्रिक अम्ल (क्रेब्स) चक्र

NCERT Fig 12.3 · interactive diagram

Parts and their functions

• Acetyl CoA (ऐसीटिल CoA) — Formed in the matrix: pyruvic acid + CoA + NAD⁺ → acetyl CoA + CO₂ + NADH (pyruvate dehydrogenase).
• Citric acid (6C) (सिट्रिक अम्ल (6C)) — First product of the cycle — hence citric acid cycle; enzyme citrate synthase.
• α-Ketoglutaric acid (5C) (α-कीटोग्लूटैरिक अम्ल (5C)) — Formed after decarboxylation; then succinyl CoA.
• Succinic acid (4C) (सक्सिनिक अम्ल (4C)) — Succinyl CoA → succinic acid makes 1 GTP (substrate-level phosphorylation).
• Malic acid (4C) (मैलिक अम्ल (4C)) — Oxidised to OAA with NADH formation.
• Oxaloacetic acid (4C) (ऑक्सैलोऐसीटिक अम्ल (4C)) — First member of the cycle; must be regenerated.
• Products (उत्पाद) — Per turn: 3 NADH + H⁺, 1 FADH₂, 1 GTP, 2 CO₂.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 12.3. Report a mistake