Through absorption, cerebrospinal fluid eliminates waste produced by metabolic processes inside the CNS, including proteins and excess neurotransmitters. This process also eliminates bacteria, viruses, and anything else irrelevant to the healthy functioning of the system. Nutrients from the blood, including glucose, lipids, electrolytes, and a high concentration of proteins, are supplied to the fluid through the choroid plexus, the CSF-making structure inside the ventricles of the brain. Nutrients are then carried to the extracellular space of the brain and distributed appropriately.

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