The primary function of the nervous system is to coordinate and control bodily functions by transmitting signals between different body parts. This complex network of neurons and glial cells enables communication between the brain, spinal cord, and peripheral nerves. The nervous system receives stimuli from sensory organs, processes this information, and elicits appropriate responses. It regulates voluntary movements, such as walking or speaking, as well as involuntary actions like breathing and digestion. Additionally, the nervous system plays a crucial role in cognition, memory, emotions, and maintaining homeostasis, ensuring the body responds effectively to internal and external changes.