During excitatory synaptic transmission the electrical signal carried along the axon of a presynaptic neuron causes the release of neurotransmitters into the synapse and its sub sequent reception by receptors on the postsynaptic neurons The activation of receptors on the postsynaptic neurons then triggers the generation of the new action potential in that neuron Both chemical and electrical neuronal signals are mediated by the movement of ions across the neuronal membrane Which of the following correctly describes the movement of ions across neuronal membranes as an action potential is conducted down the neuron A B C D At rest the internal side of the membrane has an overall positive charge but as the ac tion potential moves down the neuron more ions flow into the neuron making the membrane more positive At rest the internal side of the membrane has an overall positive charge which intensi fies the action potential At rest the internal side of the membrane has an overall positive charge but as the ac tion potential moves down the neuron more ions flow out of the neuron to neutralize the membrane At rest the internal side of the membrane has an overall negative voltage As the action potential moves down the neuron the internal membrane becomes positive as ion channels open and ions flow into the neuron