Which of the following does not bring about increased airway resistance?
A)asthma
B)epinephrine
C)slow-reactive substance of anaphylaxis
D)emphysema
E)excess mucus production

Question

Quizplus · Accepted Answer

Epinephrine is a bronchodilator and therefore causes a decrease in airway resistance. The other options listed all bring about increased airway resistance. Asthma is characterized by bronchoconstriction, inflammation, and mucus production which all contribute to airway resistance. Slow-reactive substance of anaphylaxis (SRS-A) is a mediator released during allergic reactions that causes bronchoconstriction. Emphysema involves destruction of the alveoli leading to decreased surface area for gas exchange, which can result in airway resistance. Excess mucus production can also contribute to airway resistance by narrowing the airway lumen.

Which of the Following Does Not Bring About Increased Airway