Compounds classified as ________ alter synaptic transmission by changing neurotransmitter receptor numbers or affecting the breakdown and/or removal of neurotransmitter.

A) neuromodulators
B) inhibitory neurotransmitters
C) excitatory neurotransmitters
D) neurohormones

Neuromodulators

Chemicals released by nerve cells to signal, modify, and regulate the activity of other neurons.

Synaptic Transmission

The process by which one neuron communicates with another by passing chemical or electrical signals across a synapse.

Neurotransmitter Receptor

A protein molecule on a neuron's surface that reacts to a specific neurotransmitter, influencing neural communication.