The main function of the nervous system is to coordinate and regulate the body's actions and processes. It acts as the body's communication network, encompassing the brain, spinal cord, and peripheral nerves. The nervous system processes sensory information, allowing organisms to respond to their environment effectively. It controls voluntary movements, as well as involuntary functions like heart rate and digestion. Additionally, it plays a crucial role in cognitive functions such as thought, learning, and memory. The nervous system ensures that all bodily systems work harmoniously together for overall health and function.