Cerebrospinal Fluid Can Be Described as Which of the Following

Multiple Choice

Cerebrospinal fluid can be described as which of the following?
I. functioning in transport of nutrients and hormones through the brain
II. a product of the filtration of blood in the brain
III. functioning to cushion the brain
IV. filling spaces between glial cells and neurons in the grey matter

A) only I and III
B) only II and IV
C) only I, II, and III
D) only II, III, and IV