Neurotransmitters are molecules that cross the synaptic cleft via

A) active transport and always inhibit the postsynaptic neuron.
B) active transport and always excite the postsynaptic neuron.
C) passive diffusion and either excite or inhibit the postsynaptic neuron.
D) passive diffusion and always inhibit the postsynaptic neuron.
E) passive diffusion and always excite the postsynaptic neuron.

Neurotransmitters

Chemical substances in the body that help in transmitting signals across a synapse from one neuron to another.

Synaptic Cleft

A narrow gap between the terminal end of a neuron and the neighbouring neuron or cell, across which neurotransmitters are released for communication.

Passive Diffusion

The movement of substances across a cell membrane without the need for energy input, from an area of higher concentration to an area of lower concentration.