Which statement best describes cerebrospinal fluid (CSF)?

Which statement best describes cerebrospinal fluid (CSF)?

• A. The fluid around brain and spinal cord that protects and cushions
• B. A plasma-like fluid within arteries
• C. The gray matter of the brain
• D. The lipid layer covering the brain

Answer: (A)

Cerebrospinal fluid is the clear fluid that surrounds the brain and spinal cord, filling the ventricles and subarachnoid spaces. Its primary role is to cushion the delicate neural tissue by providing buoyant support, which helps reduce the effective weight of the brain and protects against injury. It also helps maintain a stable chemical environment by distributing nutrients and removing waste products, contributing to the brain’s overall homeostasis. This description captures the essential function of CSF as a protective, cushioning fluid around the CNS. The other options describe blood plasma, neural tissue, or a lipid covering—none of which match what CSF is or does.

Cerebrospinal fluid is the clear fluid that surrounds the brain and spinal cord, filling the ventricles and subarachnoid spaces. Its primary role is to cushion the delicate neural tissue by providing buoyant support, which helps reduce the effective weight of the brain and protects against injury. It also helps maintain a stable chemical environment by distributing nutrients and removing waste products, contributing to the brain’s overall homeostasis. This description captures the essential function of CSF as a protective, cushioning fluid around the CNS. The other options describe blood plasma, neural tissue, or a lipid covering—none of which match what CSF is or does.