"Runner's high" from intense physical activity occurs due to the release of internal substances in the brain known as ___.
A) hallucinogens
B) synthetic compounds
C) narcotics
D) opiates

Question

Quizplus · Accepted Answer

"Runner's high" occurs due to the release of endorphins, which are opiates or natural painkillers produced by the brain during exercise or physical activity.

"Runner's High" from Intense Physical Activity Occurs Due to the Release