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Chap 12 cont.


extracellular fluid is rich in Na and Cl
inward flow of ___ cant keep up with outward flow of ___ na/ K
graded potentials have _____ and ______ hyperpolarization and depolarization
membrane has become more negative hyperpolarization
membrane has become more positivit depolarizaion (goes up) MV
in ____ the signals are ____, meaning they vary in alplitude (size), depending on the strength of the stimulus and localized graded
graded potentials occur most often in the ___ and _____ of a neuron dendrites and cell body
_____ stiumulation of membranes with mechanical gated ion channels (pressure) mechanical
____ stiumulation of membranes with ligand gated ion channels (neurotrasnmitter) chemical
____ or _____ is a sequence of radibly occuring events that increase and eventually reverse the membrane potential (depolarize) and then restore it to the resting state (repolarize) action potential (AP)
During an AP, voltaged gated ____ and ____ channels open in sequence Na and K
when Na rushes in its depolarization
K rushes out it is repolarization
in the depolarizing phase of AP the voltaged gated ____ channels open and __ rushes into cell Na
depolarizing is an example of positive feedback process
when a chem or mech. stimulus caused a graded potentiatl to reach at least -55mV or threshold depolarization
when threshold pontential of -55 is reach, voltaged gated K channels open repolarizing
in repolarizing ___ channel is much slowing than Na channel opening which caused depolaization K
Created by: Mollie28