Neurotransmitters
A)are released by endocytosis.
B)all bind to the same receptor.
C)usually regulate ion channels.
D)are actively transported across the synaptic cleft.

Question

Quizplus · Accepted Answer

Neurotransmitters usually regulate ion channels, which either increase or decrease the likelihood that the postsynaptic neuron will fire an action potential.

Answer: D 
 Neurotransmitters are actively transported across the synaptic cleft by specific transporters located on the pre and post-synaptic membranes. This allows for precise control of synaptic transmission.

Option A is incorrect as neurotransmitters are not released by endocytosis, but by exocytosis from the terminal boutons of the presynaptic neuron. Option B is incorrect as neurotransmitters can bind to different receptors depending on their chemical structure, and the type of receptor can influence the effect of the neurotransmitter.