The rapid change in membrane potential that occurs when a ligand binds to an ionotropic receptor is caused by which of the following?
A) the rapid G protein response that indirectly links receptor to channel
B) the rapid gating of the ion channel by G protein
C) the large ion gradient across the membrane
D) the presence of that protein functioning as both an ionotropic receptor and as the ion channel
E) the G protein amplification that causes the rapid channel response

Question

Quizplus · Accepted Answer

Ionotropic receptors function as both receptors and ion channels, allowing for the rapid change in membrane potential when a ligand binds to them. This direct gating of the ion channel by the ligand (without the involvement of G proteins) leads to immediate changes in ion flow across the membrane.

The Rapid Change in Membrane Potential That Occurs When a Ligand