Cranial and spinal nerves are part of the system

Central. They are part of the central nervous system. At least I think so. 

No matter what they say you can’t change who you are so when u tell them whatever they say jus be like i’m who i am and i won’t change

Whats important is to eat healthy food to prevent heart disease. another why not to get heart disease is to always exercise in a timely manner. lastly, always stay active and go to the doctor for checkups just in case.