Respiratory System

Question 1

Explain what occurs during sympathetic innervation of smooth muscles in walls of the conducting airways

Answer 1

1. Sympathetic adrenergic neurons activate beta-2 receptors on bronchial smooth muscle
2. Circulating epinephrine released from adrenal medulla and beta-2 adrenergic agonists also activate beta-2 receptors
3. Relaxation and dilation of airways