Final answer:
The total amount of CSF in the average adult nervous system is about 80-150 mls, and it is continuously produced and drained to protect and maintain a stable environment for the nervous tissues.
Step-by-step explanation:
The total amount of cerebrospinal fluid (CSF) in the average adult nervous system is approximately 80-150 mls, which corresponds to option C. CSF is produced by specialized ependymal cells within the choroid plexus of the brain's ventricular system. About 500 milliliters of CSF are produced daily, but given the limited capacity of the brain to hold this fluid, a significant portion is continuously drained into the blood through arachnoid granulations.
The CSF acts as a cushion, providing mechanical and immunological protection to the brain and also maintains a stable environment for the nervous tissues. While the body continuously produces this fluid, any blockage within the ventricles can lead to a condition called hydrocephalus, potentially causing severe neurological problems.