As he is running his first 10k (ten kilometer) race, Apollo finds that he is starting to hurt and wear out at the third mile. He pushes through, and suddenly experiences a brief period where the pain goes away and he can run faster than he had been running. This "runners high" is facilitated by the release of ________.
A) endorphins
B) acetylcholine
C) cortisol
D) dopamine

Question

Quizplus · Accepted Answer

Endorphins are natural painkillers produced by the body, often released during prolonged, continuous exercise like running, leading to a feeling of euphoria commonly referred to as a "runner's high."

As He Is Running His First 10k (Ten Kilometer) Race