In biology, the nervous system is a highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body. Invertebrates, it consists of two main parts, called the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The nervous system plays a role in nearly every aspect of our health and well-being. It guides everyday activities such as waking up; automatic activities such as breathing; and complex processes such as thinking, reading, remembering, and feeling emotions. The nervous system controls Brain growth and development. Problems with the nervous system can cause a variety of symptoms almost anywhere in the body. A few examples of symptoms that may be caused by a nervous system problem include Numbness or tingling: weakness or a reduced ability to move any part of the body (not caused by pain). The nervous system is made up of the brain, spinal cord and nerves. It is the body's communication system that controls much of what your body does. It allows you to do things like walk, speaks, swallow, breathe and learn, and controls how your body reacts in an emergency.