Question

An isolated guinea-pig ileum preparation is set up for "transmural stimulation" which produces 'twitch' contractions. The transmitter released by this stimulation is _________. The subtype of receptor mediating the contractile response to this receptor is _________

A) Acetylcholine; muscarinic

B) Norepinephrine; adrenergic

C) Serotonin; serotonergic

D) Dopamine; dopaminergic

Answer 1

The transmitter released by transmural stimulation in an isolated guinea-pig ileum preparation is acetylcholine (ACh). The subtype of receptor mediating the contractile response to ACh in this receptor is muscarinic receptor.

Step-by-step explanation:

The transmitter released by transmural stimulation in an isolated guinea-pig ileum preparation is acetylcholine (ACh). The subtype of receptor mediating the contractile response to ACh in this receptor is muscarinic receptor. The muscarinic receptor is a G protein-coupled receptor and does not exclusively cause depolarization of the postsynaptic membrane.