Jen and jack are seated in the same row in an airplane but across the aisle from each other. if the information they exchange across the aisle represents the neural impulse between neurons, and jen and jack represent the neurons, the aisle most likely represents the terminal button interneurons synapse nodes of ranvier

Synapse

A synapse is a junction where there is a small gap between the neurons.The synapse permits the flow of electrical or chemical signals from neuron to neuron, allowing these neurons to communicate and pass information among themselves. 

The chemical synapse converts the electrical signal to a chemical response by releasing chemicals called neurotransmitters, which are received by receptor sites in the other neurons. The electrical synapse allows the flow of ions from one neuron to another to pass the electric current or signal.