When neurotransmitter binds a(n) ___ receptor, the receptor activates chemicals inside the neuron that ultimately trigger the opening of ion channels in other parts of the membrane.

Answer.

metabotropic

Explanation:

These are receptors which act through a second messenger,They are not directly connected to the opening of ion channels.They are found in the membrane of the Eukaryotas, and are confined  to membrane surfaces and  in vesicles.

Histamine, dopamine, muscarinic acetycholine receptors are examples  of thezse receptors.

Theses receptors have ligands (neurotransmitters) which binds to the post synaptic membrane to cause opening of  sodium ion s channels,for the action  potential to be transmitted from the  pre-synaptic to post -synaptic neuron.

In the mechanism, the neurotransmitter bind with the  receptors which  act as the  transducers, this  then activates the G-proteins.The latter in turn activate the primary effector.The resultant effect is the activation of the secondary  messenger. which leads to opening of the channels

This sequence of events leading to the opening of the channels takes longer , therefore theses receptors are not involved in opening of channels involved in fast responses.But they  have a long lasting effed compare to the ionotropic receptors,( the ligand-gated ion channels) which are faster ,