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. epinephrine
B. somatotropins
C. gonadotropins
D. beta endorphins
E. lipotropins
Answer: D
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A) vesicular exocytosis B) vesicular endocytosis C) axonal transport D) smooth muscle contractions E) ciliary fluid currents
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