Two drugs act on the same receptor in the lungs. One (Drug A…

Two drugs act on the same receptor in the lungs. One (Drug A) stimulates the receptor to open airways; the other (Drug B) blocks the receptor and prevents the first drug from working. Which drug is an agonist? Which is an antagonist? Why might both types be clinically useful?

William has been using cocaine recreationally for a long tim…

William has been using cocaine recreationally for a long time. He is not interested in stopping at this time and does not believe that he is addicted. Which of the following is an example of a symptom that would be required for William to be diagnosed with a cocaine addiction?