neuron firing / parts of neuron

axon terminal button

end point of neurons / release neurotransmitters to signal next neuron

vesicles

store transmitters

synapse

junction (middle) between axon tip of signaling neuron and dendrite of receiving neuron

receptor sites

receiving neurotransmitter site on dendrites

resting potential

-70mv

action potential / threshold

is initiated when neuron is fired (-55mv)

repolarization

sodium chambers close to return to resting state

refractory period

frame of time which neuron can’t be fired

neurotransmitter

chemical messenger that transmits info

excitory neurotransmitter

excite next neuron to fire

inhibitory neurotransmitter

inhibits next neuron from firing

agonist

durgs that excite by mimiking excitory neurotransmitters

antagonist

drugs that inhibit / block ns

sensory / afferent neuron

carries information from PNS to CNS

motor / efferent neuron

carries information from CNS to rest of body

interneuron

carries information between sensory/afferent and motor/efferent neurons

dendrite

place to receive information from other neurons

soma

cell body that contains nucleus and chromosomes

myelin sheath

insulating layer of fatty material around axon

nodes of Ranvier

gaps between myelin sheath

glia/glial cells

support system for neurons / neural nannies