Which of the following is a function of cerebrospinal fluid?

Cerebrospinal fluid (CSF) performs multiple vital functions in the central nervous system, and recognizing these functions helps underscore its importance.

Buoyancy refers to the ability of the cerebrospinal fluid to support the brain, effectively reducing its weight and preventing damage from the skull's hard interior. This buoyancy is crucial as it allows the brain to float within the cranial cavity, greatly minimizing the risk of injury due to impacts that could occur.

Protection is another key function of CSF. It serves as a physical barrier, cushioning the brain and spinal cord from trauma. The fluid acts as a shock absorber, mitigating the impact of sudden movements or blows to the head, thereby guarding against damage.

Finally, chemical stability is also an essential function. CSF helps maintain homeostasis within the central nervous system by regulating the composition of the extracellular environment. This includes controlling the concentrations of ions and nutrients, thus ensuring optimal conditions for neuronal function.

Together, these functions demonstrate the comprehensive role that cerebrospinal fluid plays in safeguarding and maintaining the overall health of the central nervous system, which is why the most accurate answer encompasses all of these aspects.