A researcher asks individuals to participate in an experiment that causes arm muscle strain.
The participants are instructed to use a provided muscle rub after the activity. One group gets a rub with active ingredients to reduce pain whereas the other group gets a ____________ without active ingredients.
a. exogenous ointment
b. endogenous ointment
c. treatment
d. placebo
Question 2
A drug blocks the receptor, preventing activation by the usual neurotransmitter that activates that receptor. This drug would be considered a(n):
a. competitive agonist.
b. non-competitive agonist.
c. non-competitive antagonist.
d. competitive antagonist.