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## Presynapse Types
### The Metabolic "Vise": Why Personalities Exist
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- **Role:** Astrocytic lactate is **not the primary fuel for burst activity** but is critical for:
- **Recovery & Sustenance:** Replenishing neuronal energy stores *after* intense activity.
- **Long-term Maintenance:** Supporting baseline metabolic needs.
- **Glycogen Buffer:** Astrocytes store glycogen, which can be broken down to glucose and then lactate during periods of high demand or low blood glucose, acting as an emergency energy reserve for the brain.
- **Glycogen Buffer:** Astrocytes store glycogen, which can be broken down to glucose and then lactate during periods of high demand or low blood glucose, acting as an emergency energy reserve for the brain.