Question

During the transmission of an action potential between two pre-ganglionic neurons, which statement below describes the correct flow of Na+ after binding of the neurotransmitter?

Influx into the post-synaptic neuron dendrite

Influx into the pre-synaptic neuron axon

Efflux out of the post-synaptic neuron cell body

Efflux out of the pre-synaptic neuron dendrite

Answer 1

During the transmission of an action potential between two pre-ganglionic neurons, correct flow of Na+ after binding of the neurotransmitter :-

(a) Influx into the post-synaptic neuron dendrite

The synapse is formed between the axon terminal of pre-synaptic neuron and dedrite of the post-synaptic neurons. So when the pre-ganglionic neurons binds to neurotransmitter, there is efflux from axon terminal of the pre-synaptic neuron which goes to synapse then there is influx of Na+ into dendrites of post-synaptic neuron.

So the other options about action potential transmission are wrong.

Thus the correct answer is (a) Influx into the post-synaptic neuron dendrite.