AP Unit 2 (9-12) Vocab

a nerve cell; the basic building block of the nervous system

• nucleus

• neuron

• axon

• synapse

the part of the neuron that contains the nucleus

• dendrite

• glial cell

• cell body

• axon

a neuron's often bushy, branching extension that receive and integrate messages

• axon

• dendrite

• nucleus

• myelin sheath

the neuron extension that passes messages through it's branches to other neurons and muscles

• cell body

• dendrite

• glial cell

• axon

a fatty tissue layer segmentally encasing the axons of some neurons

• myelin sheath

• nucleus

• fiber coat

• dendrite

cells in the nervous system that support, nourish and protect neurons

• vitamin cell

• worker cell

• glial cell

• fiber cell

neural impulse; brief electrical charge that travels down an axon

• action potential

• threshold

• all or none

• cell burst

the level of stimulation required to trigger a neural impulse

• action moment

• time release

• threshold

• all or none

in neural processing, a brief resting pause that occurs after a neuron has fired

• rest period

• break potential

• all-or-none

• refractory period

a neuron's reaction of either firing or not firing

• excitatory potential

• threshold

• tipping potential

• all-or-none response