<span>The peripheral nervous system
</span><span>-links the body to the brain and spinal cord.
</span>-is made up of sensory and motor neurons.<span>
</span>
I am not sure what you asking, but since Justin doesn't want to go to the graduation party because he know he going to be embarrass from not gradating with the rest of his friends.
When you exercise, your body produces something called endorphins (it's sort of like morphine), and it makes your body feel less pain and make you feel more happy. In this case, the endorphins combat your stress and make you feel better mentally.
