27824508
Description
Flashcards by Reese Mumbauer, updated more than 1 year ago
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Created by Reese Mumbauer
almost 4 years ago
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| 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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