Final answer:
Cerebrospinal fluid (CSF) is the fluid that fills the subarachnoid space, providing protection and nourishment to the central nervous system.
Explanation:
Cerebrospinal fluid (CSF) is the fluid that fills the subarachnoid space surrounding the brain and spinal cord. CSF acts as a cushion and shock absorber, providing protection and nourishment to the central nervous system. It circulates metabolic wastes, provides buoyancy to the brain, and plays a crucial role in maintaining brain function.
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