Answer:
The correct terms or fillers are -
1. Synaptic cleft
2.Neurotransmitter
3. Postsynaptic
4. Gated
5. Graded
6. Resting membrane
7. Receptive
Explanation:
Between each presynaptic and postsynaptic neuron is a Synaptic cleft that is the fluid-filled space between them. Each presynaptic neuron releases Neurotransmitter that binds with receptors in the Postsynaptic segment of a postsynaptic neuron. The Gated channels of the receptive segment open when these molecules bind. Specific ions then cross the membrane, initiating a Graded potential in the postsynaptic neuron. This local potential is a small voltage change in the Resting membrane potential.
Graded potentials that occur in postsynaptic neurons are specifically called Receptive potentials.