Willy stepped out of his car because the police officer told him to do so. What best describes Willy's behavior?

Individuals being treated for cancer may develop nausea when they arrive at the place where they have been receiving chemotherapy. In this case, the conditioned stimulus is ________

a. chemotherapy b. nausea c. the place where therapy takes place d. avoidance by canceling the appointment

The idea that pain signals must pass through a type of "doorway" in the spinal cord is referred to as the ________

a) opponent-process theory of pain
b) revolving door theory of pain
c) substance P theory of pain
d) gate-control theory of pain