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Anatomy 12

nervous system II

TermDefinition
outside of membrane internal positive negative (-70mV, not always)
Na+/K+ pump activity 3 Na out for every 2 K in
fixed anions protein
nerve impluse also called action potential
hyperpolarization membrane becomes more negative
depolarization membrane becomes more positive
decremental short distance communication (only in dendrites and cell body)
repolarization ability to go back to resting state (probably -70)
action potential sequence of rapidly occurring events that decrease and reverse membrane potential (depolarization) and restore it to resting state (repolarization)
all or none principal if stimulus reaches threshold, action potential is always the same -strong stimulus does not give bigger impulse
Created by: bellai
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