These channels are found on the axon. make action potentials. These channels block themselves (inactivate) after a short time.
These channels are found all over the neuron. They turn off activity.
These channels are found at the synapse. They detect glutamate and turn on the neuron. Glutamate is a neurotransmitter.
These channels are found at the synapse. They detect GABA and turn off the neuron. GABA is a neurotransmitter.