Astrocytes help maintain the central nervous system (CNS)extracellular milieu by:

A)Taking up and redistributing excess K⁺ and other ions.
B)Wrapping extensions of their cytoplasm around axons.
C)Phagocytosing damaged CNS neurons.
D)Lining the ventricular surface of the CNS.
E)Differentiating into neurons in response to injury.