M3 receptors are present on which of the following?
a. Heart, postganglionic parasympathetic nerves
b. Parasympathetic ganglia, nasal submucosal glands
c. Airway smooth muscle, submucosal glands
d. Postganglionic cholinergic nerves, possible effect on CNS
Question 2
The neurotransmitter norepinephrine is terminated by the enzymes __________ and __________.
a. catechol O-methyltransferase (COMT) and monoamine oxidase (MAO)
b. catechol O-methyltransferase (COMT) and cholinesterase
c. cholinesterase and monoamine oxidase (MAO)
d. monoamine oxidase (MAO) and pseudocholinesteras e