Final answer:
Glial cells are supporting cells in the nervous system. They have different functions and play vital roles in neuron function and protection. Astrocytes, microglia, oligodendrocytes, and Schwann cells are types of glial cells with specific functions.
Step-by-step explanation:
Glial cells, also known as neuroglia or glia, are the other type of cell found in the nervous system. They are considered to be supporting cells that help neurons function. There are several different types of glial cells, each with different functions. Astrocytes regulate ion concentration, uptake and breakdown of neurotransmitters, and form the blood-brain barrier. Microglia protect the nervous system against infection. Oligodendrocytes produce myelin in the central nervous system, while Schwann cells produce myelin in the peripheral nervous system.