If a post synaptic neuron is stimulated to threshold by spatial summation this implies that the postsynaptic cells has many synapses with many presynaptic neurons the post synaptic cell has a lower than normal threshold the post synaptic cell has many voltage gated ion channels the post synaptic cell is slow to repolarize

The postsynaptic cells has many synapses with many presynaptic neuron.

Synapse can be defined as a structure that allow neuron to send a chemical or electrical signal to another neuron. However, postsynaptic potential is a temporary change in the electrical polarization of the membrane of a nerve cell and they are known to be receiver of neurotransmitter message.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /