Tony is deathly afraid of heights. His therapist uses a virtual reality program that allows Tony to feel like he is experiencing gradually increasing levels of height. This therapy technique is a type of

With regular use of opiates, the brain stops producing the natural pain relieving __________; as a result of this, and physiological dependence, the person experiences ___________

a. endorphins; withdrawal c. endorphins; tolerance b. morphine; withdrawal d. morphine; tolerance

All of the following are methods to assess body fat EXCEPT:

A) ?imaging the body. B) ?skin-fold technique. C) ?body-mass index. D) ?self-reports.