Final answer:
The site of information integration in the nervous system is the trigger zone, specifically the axon hillock where multiple signals are integrated to determine whether an action potential is fired.
Step-by-step explanation:
The site of information integration in the nervous system is the trigger zone. A signal starts at the axon terminal and travels through the axon to synapse with the dendrites of another neuron. The dendrites receive this signal and pass it through the soma. It is in the axon hillock where multiple signals from multiple synapses are integrated before being sent along the axon to reach another cell. This integration at the axon hillock is crucial as it determines whether the neuron will fire an action potential or not, summing up the excitatory and inhibitory inputs the neuron has received.