Final answer:
About 500 milliliters of cerebrospinal fluid are produced daily in the brain. It circulates through the central nervous system and is continually drained to keep balance and prevent hydrocephalus.
Step-by-step explanation:
The amount of cerebrospinal fluid (CSF) produced each day is approximately 500 milliliters. CSF is formed by the filtration of blood in the choroid plexuses in the brain's four ventricles. After production, CSF circulates through the ventricles and within the subarachnoid space before it is reabsorbed into the blood via arachnoid granulations. This reabsorption helps to remove metabolic wastes from the CNS. Considering the brain can only contain 135-150 ml of CSF, the excess fluid needs to be continuously drained to maintain proper balance and to prevent conditions like hydrocephalus, which can lead to severe complications.