Which of the following is(are) the function(s) of the cerebrospinal fluid (CSF) system?
A. To provide water and certain amino acids to the extracellular fluid
B. To supply specific ions to the extracellular fluid
C. To provide buoyancy to the brain
D. A and B
E. A, B, and C
ANS: E
Rationale: The CSF system works to regulate the extracellular milieu by supplying water, amino acids, and specific ions to the extracellular fluid. In addition, the buoyancy provided by the CSF provides protects the brain by absorbing some of the impact when the head is struck
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