What is the term for the complex communication network of the body composed of all neurons?

The term for the complex communication network of the body composed of all neurons is the nervous system. The nervous system includes the brain, spinal cord, and a vast network of neurons throughout the body, enabling it to transmit signals and communicate information rapidly. This system is responsible for coordinating voluntary and involuntary actions, processing sensory information, and facilitating responses to the external environment.

In contrast, the muscular system is primarily involved in movement and the ability of organisms to produce movement through muscle contractions. The endocrine system, on the other hand, consists of glands that release hormones to regulate various bodily functions, acting more slowly than the nervous system. The cardiovascular system is responsible for circulating blood and transporting nutrients, gases, and waste products throughout the body. Each of these other systems plays a crucial role but does not encompass the extensive network of neurons that characterizes the nervous system.