Select the sequence of events for the olfactory pathway
1) a second messenger opens cation channels (Na⁺ and Ca⁺²)
2) depolarization of olfactory receptor cells occurs
3) odorant binds to olfactory receptor protein
4) G protein activates cyclic adenosine monophosphate

Question

Quizplus · Accepted Answer

The olfactory pathway starts with the odorant binding to olfactory receptor protein, which is followed by G protein activation. This leads to the production of cyclic adenosine monophosphate as a second messenger. This, in turn, opens cation channels, leading to the depolarization of olfactory receptor cells. Therefore, the correct sequence of events is 3, 4, 1, 2. Choice C is the only option that presents this sequence.

Select the Sequence of Events for the Olfactory Pathway