| A | B |
|---|
| RESTING MEMBRANE | unstimulated membrane |
| ACTION POTENTIAL | nerve impulses |
| POLARIZED | charged membranes |
| DEPOLARIZATION | excessive sodium ions in cell |
| REPOLARIZATION | original polarity restored |
| REFRACTORY PERIOD | recovery time |
| THRESHOLD LEVEL | minimum level if stimulation needed to produce response |
| ALL OR NONE RESPONSE | response compltet or nil |
| SYNAPSE | spaces between neurons |
| PRESYNAPTIC NEURON | carry impulses to synapse |
| POSTSYNAPYIC NEURON | carry impulses from synapse |
| ACETYLCHOLINE | chemical transmitter |
| CHOLINESTERASE | enzyme breaks down acetylcholine |
| HYPERPOLERIZATION | membranes more permeable to potassium |
| SUMMATION | accumulation of transmitter chemicals from more than 1 neuron |
