Excitation and Inhibition

Neurotransmitters can be classified as either excitatory or inhibitory _____________

This means they either ______________ the chance of the Post-synaptic neuron firing its impulse/action potential

In their action

Increase or decrease

For instance, serotonin usually causes inhibition in the receiving neuron; the neuron becomes more ______________ and is therefore _________ to fire

Negatively charged

Less likely

Inhibitory neurotransmitters act as the nervous system's ‘_________’ and are generally responsible for ________________, inducing sleep and filtering out unnecessary excitatory signals

Off switch

Calming the mind and body

An inhibitory neurotransmitter bidding with a Post-synaptic receptor results in an…

Inhibitory post-synaptic potential (IPSP)

In contrast, neurotransmitters such as ____________ are excitatory; they are the nervous system's ‘_________’

Noradrenaline

On switch

These cause excitation of the Post-synaptic neuron (excitatory Post-synaptic potential - EPSP) by…

Increasing its positive charge and making it more likely to fire