Definition of nervous system

Answer 1

The nervous system is a network of specialized cells that communicate information about an animal's surroundings and itself. It processes this information and causes reactions in other parts of the body. It is composed of neurons and other specialized cells called glia, that aid in the function of the neurons. The nervous system is divided broadly into two categories: the peripheral nervous system and the central nervous system. Neurons generate and conduct impulses between and within the two systems. The peripheral nervous system is composed of sensory neurons and the neurons that connect them to the nerve cord, spinal cord and brain, which make up the central nervous system. In response to stimuli, sensory neurons generate and propagate signals to the central nervous system which then processes and conducts signals back to the muscles and glands. The neurons of the nervous systems of animals are interconnected in complex arrangements and use electrochemical signals and neurotransmitters to transmit impulses from one neuron to the next. The interaction of the different neurons form neural circuits that regulate an organism's perception of the world and what is going on with its body, thus regulating its behavior. Nervous systems are found in many multicellular animals but differ greatly in complexity between species

Answer 2

The nervous system is the organ system in an animal consisting of specialized cells called neurons that are electrically excitable and process and transmit information using electrochemical processes. The nervous system transmits signals quickly between different parts of the body and regulate and coordinate many different bodily actions.

Answer 3

The complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord.

Answer 4

The system of neurons throughout your body, including your brain. These are responsible for the communication between different body parts and for instance the activation of muscles.