What is one of the primary functions of the nervous system?

The primary function of the nervous system is to regulate all body activities. It acts as the control center for the body, processing sensory information, coordinating responses, and facilitating communication between different body parts. The nervous system enables quick responses to stimuli, allowing the body to react to changes in the environment effectively. This includes regulating movement, sensory perception, and even cognitive functions such as thought and memory.

While hormone production is a function associated with the endocrine system, digestion is primarily managed by the gastrointestinal system, and blood circulation is the responsibility of the cardiovascular system. In contrast, the nervous system integrates and oversees the activities of these systems, making it essential for overall physiological regulation. Therefore, the choice highlighting the regulation of all body activities accurately reflects the nervous system's fundamental role.