The nervous system includes all the organs and tissues which enable animals to respond to changes in their environment. A change in the environment is called a response. The nervous system of mammals is composed of two parts: the central nervous system and the peripheral nervous system.   Central Nervous System This is made up of the brain and the spinal cord. Both are made up of thousands of nerve cells or neurones. The functions of the central nervous system is correlation of impulses from various sense organs and storage of impulses as information or impressions in the brain for reaction to future similar stimuli. a) The Brain: The brain…