You are having a hard time getting the past medical history of a patient who is short of breath. Which one of the following pieces of information would lead the EMT to believe that the patient has a history of chronic lung disease, such as emphysema or chronic bronchitis?

The liver's partial or complete inactivation of a drug before it reaches the systemic circulation is the _________________________________ effect

a. hepatic filtration c. liver–blood barrier b. first-pass d. antidrug

What is the mediastinum?

a. Membranous sac surrounding the heart and great vessels b. Middle layer of muscle fibers constituting the heart c. Point of division of the trachea into the bronchi d. Structure separating the right and left thoracic cavities