Alissa is a long distance runner. She loves the feeling she gets about 4 miles into a run and she feels like she could just run forever. Which neurotransmitter is her body releasing to produce that runners high that reduces feelings of pain?

Endorphins

Explanation: Endorphins are chemicals secreted by the brain also known as neurotransmitters that send electrical signals inside the nervous systems.

The factors that initiate the secretion of endorphins are stress and pain.

When endorphins are secreted they reduce feelings of pains, and in runners that cause a phenomenon called " Runners high" which allows runners to keep running without feeling pain or stress.