Learn / Metabolism
Metabolic pathways
Every FMK pathway as a clickable map. Pick one pathway to hammer it — next step, enzyme, regulator, cofactor, and the facts that get tested (NADPH and who needs it, rate-limiting steps, deficiencies) — or set it to all pathways for a mixed drill. Every answer says which enzyme and which pathway.
Glycogen synthesis & breakdown · Cytosol — liver (blood glucose) and muscle (own fuel). Enzymes sit beside the arrows; a ★ marks the rate-limiting step. The map scrolls inside its panel.
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Glycogen synthesis & breakdown
Blood glucose (liver only)
Made from Glucose-6-phosphate (from breakdown) by Glucose-6-phosphatase (liver, ER)
Glucose-6-phosphatase (liver, ER) · irreversible — Glycogen synthesis & breakdown
Deficiency: Von Gierke disease (GSD I) — severe fasting hypoglycemia, lactic acidosis, hyperuricemia, hyperlipidemia; blocks glycogenolysis AND gluconeogenesis
Condition cards:Von Gierke disease (GSD type I; secondary hyperuricemia) →