Action Potentials


Reese Mumbauer
Flashcards by Reese Mumbauer, updated more than 1 year ago
Reese Mumbauer
Created by Reese Mumbauer over 3 years ago

Resource summary

Question Answer
Passive (leakage) channels: always open
Chemically gated channels: open w/ binding of a specific neurotransmitter
Gated Channel Closed when neurotran not bound to receptor Open when neurotran attached to receptor
Voltage-gated channels: open & close in response to electrical signals
Voltage-gated channel Closed when intracellular environment neg Open when intracellular environment positive
Mechanically gated channel: open/close in response to physical deformation of receptors
Ions move quickly cross membrane Movement along electrochemical gradients Electrical current created
Voltage changed
Electrochemical Gradient: Ions flow along their chemical gradient when moving from high concentration to low concentration Ions flow along electrical gradient when move to opposite charge
Resting Membrane Potential: -70 mV
Ionic differences caused by: differential permeability of neurilemma to Na+/K+ Operation of sodium-potassium pump
Depolarization: inside membrane less neg
Repolarization: membrane return to resting membrane potential
Hyperpolarization: inside of membrane becomes more negative than resting potential
Graded Potential: short-lived, local changes in membrane potential decrease in intensity w/ distance Magnitude varies w/ strength of stimulus strong ones initiate action potential
Graded potential reached strength to initiate action potentials
Voltage changes decremental Current quickly dissipated= leaky plasma membrane Only travel over short distances
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