Bronchodilation is Caused by Sympathetic Activation and the Release of Which

Question

Bronchodilation is caused by sympathetic activation and the release of which neurotransmitter?
A) acetylcholine
B) epinephrine
C) serotonin
D) dopamine
E) nitrous oxide

Accepted Answer

Bronchodilation is caused by sympathetic activation which leads to the release of epinephrine from the adrenal medulla. Epinephrine binds to beta-2 adrenergic receptors on the smooth muscles of bronchioles, causing relaxation and dilation of the airways.