The brain's own natural production of endorphins is likely to be suppressed by
A) physical pain.
B) physical exercise.
C) heroin usage.
D) antidepressant drugs.

Question

Quizplus · Accepted Answer

Heroin usage suppresses the brain's natural production of endorphins because the brain becomes reliant on the external supply of opiates to stimulate endorphin receptors, reducing its need to produce endorphins naturally.

The Brain's Own Natural Production of Endorphins Is Likely to Be