Answer: The 3 parts of the nervous system are the central nervous system (NS), peripheral (NS), and the Automatic (NS). The central nervous system includes the brain and spinal cord and it Receives, interprets, processes, and creates messages. The peripheral (NS) carries impulses (messages) to and from the central (NS). And the automatic (NS) creates involuntary responces based on what signals the Central (NS).
The big thing is that, in countries with high life expectancy, their old people are more likely to feel engaged. This can be a cultural difference, or it can be geographical; old people are more likely to do things if they can physically get around.
