Placebo pills and acupuncture have both been effective in reducing pain. The common element in both of these methods may be their ability to stimulate the ________.

A) production of adrenal hormones
B) arousal of the peripheral nervous system
C) opening of neurological gates in the spine
D) release of endorphins

Placebo Pills

Inactive substances given to a participant in a study instead of a drug, used to assess the psychological effect of receiving treatment.

Acupuncture

A form of alternative medicine that involves inserting thin needles into the body to alleviate pain and treat various physical, mental, and emotional conditions.

Endorphins

Natural pain-relieving peptides produced by the brain that also promote feelings of pleasure or euphoria.