Question

8. Before we have an action potential EPSPs must have…

            A. Temporal Summation

            B. Spatial Summation

            C. Both A & B

D. None of the above

Answer 1

Excitatory post synaptic potential is defined as the change in membrane voltage of a post synaptic cell followed by the influx of Na⁺ ions which upshots into the activation of ligand-sensitive channels. Eventually resulting in Depolarization of postsynaptic cell and increases the propogation of action potential.

Thus, these excitatory synapses increases excitability in neurons.

All of thse requires inputs and when, multiple simultaneously inputs occur they are known to be as Spatial Summations whereas, the repeated inputs are known as Temporal Summations.

Thenceforth, both of these summation determine whether action potential will generate or not and so, the correct option is (C) Both A&B.