How many milliliters of cerebrospinal fluid circulate at any one time?

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Multiple Choice

How many milliliters of cerebrospinal fluid circulate at any one time?

Explanation:
The amount of cerebrospinal fluid present in an adult at any given moment is about 150 mL. CSF is produced continually by the choroid plexuses—roughly 500 mL per day—and is absorbed back into the bloodstream through arachnoid granulations. The system maintains a stable pool, so the total CSF circulating in the ventricles and subarachnoid space stays around 150 mL, with turnover happening several times a day (roughly 3–4 times). In contrast, neonates have a smaller CSF volume, while much larger volumes would exceed the typical adult reservoir.

The amount of cerebrospinal fluid present in an adult at any given moment is about 150 mL. CSF is produced continually by the choroid plexuses—roughly 500 mL per day—and is absorbed back into the bloodstream through arachnoid granulations. The system maintains a stable pool, so the total CSF circulating in the ventricles and subarachnoid space stays around 150 mL, with turnover happening several times a day (roughly 3–4 times). In contrast, neonates have a smaller CSF volume, while much larger volumes would exceed the typical adult reservoir.

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