What type of cells in the nervous system are responsible for supporting and protecting neurons?

The correct answer is glial cells, which play a crucial role in the nervous system by supporting and protecting neurons. These cells serve several important functions, including providing structural support, maintaining the homeostasis of the extracellular environment, forming myelin, and assisting with signal transmission. They help to ensure neurons function optimally by supplying nutrients, support, and insulation.

While neurons are the primary cells involved in transmitting signals throughout the nervous system, they rely on glial cells for their maintenance and support. Other types of cells, such as endothelial cells, contribute to the blood-brain barrier and the overall environment in which neurons operate but do not directly support and protect neurons in the same way that glial cells do. Thus, glial cells are essential for the overall health of the nervous system, making them the correct choice in this context.