3. Which of the following types of cells is the most common in the CNS? A. Astrocytes B. Oligodendrocytes C. Microglial cells D. Satellite cells

The correct answer is A. Astrocytes.<br /><br />Astrocytes are the most common type of glial cell in the central nervous system (CNS). They play a crucial role in maintaining the blood-brain barrier, regulating the extracellular environment, and supporting the repair process after injury.