During a race, a long-distance runner twisted his ankle. He finished the race without feeling any pain in his ankle. This lack of the perception of pain could be the result of an increase in ________.
A) gonadotropins
B) lipotropins
C) somatotropins
D) epinephrine
E) beta endorphins

Question

Quizplus · Accepted Answer

Beta endorphins are natural painkillers produced by the body in response to stress, including physical exertion and injury. They can mask pain, which explains why the runner did not feel his twisted ankle during the race.

During a Race, a Long-Distance Runner Twisted His Ankle