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Chap 12 cont.
nervous
| Question | Answer |
|---|---|
| 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
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