What is the primary role of neurons in the nervous system?

The primary role of neurons in the nervous system is to transmit electrical signals. Neurons are specialized cells that process and transmit information through electrical and chemical signals. This transmission of signals allows for communication between different parts of the nervous system, coordinating responses throughout the body. Neurons are critical for various functions, including reflex actions, sensory perception, and complex processes such as reasoning and memory.

In contrast, supporting immune function is not a role of neurons; that function is primarily carried out by the cells of the immune system. Transporting oxygen is the primary responsibility of red blood cells, not neurons. Finally, while the nervous system does play a role in influencing bodily tissues, it does not structure them; instead, this is typically the function of connective and epithelial tissues. Thus, the correct choice reflects the essential function of neurons in facilitating communication in the nervous system.