1	neuron		_____	chemical messengers that transport nerve impulses
2	soma		_____	transmit information from CNS to muscles and glands
3	axon		_____	principle by which neurons either have sufficient excitation to fire or they don't fire if insufficient excitation
4	terminal button		_____	fluid-filled gap between neurons
5	neurotransmitters		_____	transmit information to spinal chord and brain
6	synapse		_____	swelling at tip of axon, dispatches neurotransmitters
7	dendrites		_____	treelike structures that receive neural impulses
8	sensory neurons		_____	links one neuron to another; involved in processing in the brain
9	motor neurons		_____	insulating layer on axons that speed transmissiion of impulses
10	interneurons		_____	nerve cell
11	myelin sheath		_____	carries messages away from cell body
12	nodes of Ranvier		_____	abrupt change in charge, resulting in firing of the neuron
13	action potential		_____	cell body of a neuron
14	all-or-none		_____	gaps in myelin where impulse "jumps" to speed impulse down axon