Heroin mimics the actions of endorphins, inhibiting pain signals and creating a "high" feeling. Heroin is an example of a(n)

A proposal was submitted, and ultimately rejected, to add __________ to DSM-5. Among other features, individuals present symptoms such as reckless and uncontrolled sexual behavior

a. sexual behavior disorder b. hypersexual disorder c. hypoactive sexual behavior d. sexual desire disorder

In the United States it appears that some prejudices have ______________ over the last 50 years

a. dramatically increased b. mildly decreased c. remained the same d. dramatically decreased