The peripheral nervous system is responsible for both sending and receiving signals to and from the brain.
Explanation: The peripheral nervous system is part of the nervous system outside the central nervous system. The role of the peripheral nervous system is to connect the central nervous system to the organs, limbs, and skin. The brain and spinal cord receive and send information to other areas of the body with the help of the peripheral nervous system and this will allow one to react to stimuli in the environment.
No, only doing crunches will not help. You will have to do a variety of excercises to help lose weight around the belly. A good example of excercises that will help you lose weight would be cardio excercises.