Question 1
The presynaptic neuron and postsynaptic neuron do not directly contact each other because
◦ one would inhibit the actions of the other.
◦ they never grow to sufficient length.
◦ the synaptic vesicles keep them apart.
◦ this would cause continuous impulse transmission.
◦ acetylcholine prevents this action.
Question 2
The principal job of the human nervous system is to
◦ facilitate communication among the body systems.
◦ store information.
◦ replace or repair damaged tissues.
◦ provide for defense against pathogens.
◦ rid the body of metabolic wastes.