Which of the following do NOT transmit impulses and instead perform support functions in the nervous system?

• A. Motor neurons
• B. Interneurons
• C. Neuroglia
• D. Sensory neurons

Answer: (C)

Neuroglia, often referred to as glial cells, play a crucial role in supporting and protecting the neurons in the nervous system. Unlike neurons, which are responsible for transmitting electrical impulses and facilitating communication within the nervous system, neuroglia serve various supportive functions. These include maintaining homeostasis, forming myelin, supporting neuronal structure, and providing protection against pathogens and injury. They are essential for the overall health and function of the nervous system, but their role does not involve transmitting impulses, which is the primary function of neurons.

In contrast, motor neurons transmit impulses from the central nervous system to muscles and glands, allowing for movement and action. Interneurons connect different neurons within the central nervous system, facilitating communication between sensory inputs and motor outputs. Sensory neurons carry information from sensory receptors to the central nervous system. Therefore, the unique function of neuroglia in supporting rather than transmitting makes them the correct choice in this context.