Which of the following causes bronchodilation?

Question

Quizplus · Accepted Answer

Epinephrine (also known as adrenaline) is a hormone produced by the adrenal glands that causes bronchodilation by binding to beta-2 adrenergic receptors. This leads to relaxation of the smooth muscles surrounding the airways, allowing them to widen and increase airflow.

Option B (histamine) would cause bronchoconstriction, not bronchodilation.

Option C (parasympathetic nervous system) would also cause bronchoconstriction through activation of muscarinic receptors in the airway smooth muscles.

Option D (drugs that block beta-2 adrenergic receptors) would inhibit the effects of epinephrine and other bronchodilators, leading to bronchoconstriction.

Which of the Following Causes Bronchodilation