What function do glial cells serve in the nervous system?

Glial cells play a crucial role in the nervous system by supporting and maintaining the health of neurons. They are responsible for several protective and supportive functions that are essential for the proper functioning of nerve cells. One of their key roles is to speed up message transmission. This is accomplished through the formation of a myelin sheath around certain types of neurons, which insulates the axon and allows electrical impulses to travel more quickly along the nerve fibers.

In addition to facilitating faster communication, glial cells provide important structural support to neurons, ensuring they are correctly positioned and function optimally within the neural network. They also contribute to maintaining the environment around neurons, regulating ions and neurotransmitters, which is vital for nerve signaling.

While other options may represent functions related to the nervous system, glial cells do not transmit sensory information, conduct electrical impulses as neurons do, or produce neurotransmitters directly, although they do support the cells involved in these processes. Thus, the selection that highlights the dual role of speeding up message transmission and supporting nerve cells accurately captures the primary functions of glial cells in the nervous system.