Final answer:
Astrocytes are the most common type of glial cells in the central nervous system and function as supporting cells for neurons by providing nutrients, maintaining the extracellular environment, and contributing to the blood-brain barrier.
Step-by-step explanation:
Astrocytes are the most common type of glial cells in the central nervous system and function as supporting cells for neurons. They have many processes extending from their main cell body that interact with neurons, blood vessels, and connective tissue. Astrocytes provide nutrients to neurons, maintain the extracellular environment.