Autonomic innervation of the lungs

The video tutorial explains the role of the nervous system in regulating the bronchial tree in the lungs. It covers the neurotransmitters involved in the sympathetic and parasympathetic nervous systems and their effects on the bronchial tree. The sympathetic nervous system uses norepinephrine to cause bronchodilation, aiding in the fight or flight response. In contrast, the parasympathetic nervous system uses acetylcholine to cause bronchoconstriction, increasing mucus secretion.

Explain the function of the parasympathetic nervous system in bronchial regulation.

What is the effect of acetylcholine binding to muscarinic receptors in the lungs?