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Cricks Action Potent

Cricks Action Potential Flashcards

QuestionAnswer
What is a membrane potential? A situation where a cell has a different electrical charge inside compared to outside
What does it mean to be polarized? A polarized cell is one that has a membrane potential
What is a resting membrane potential? The RMP is the relative difference in charge between the inside and outside of a neuron or muscle cell.
What is voltage in cell membrane terminology Not electricity, rather is the difference in charged ions (+ and -) inside and outside of a cell. Typically the inside is -70mV.
What is an ion channel? An opening in a cell membrane that allows certain charged ions to pass through
What 2 causes are there for ions to cross a membrane? to diffuse from an are of higher concentration to lower concentration, or to move away from like charges, toward opposite charges
What does a leakage channel do? Allows a small, steady stream of ions to leak across the membrane
What is the most common leakage channel? Potassium (K+) so a cell is more permeable to K than Na
What is a gated channel? Similar to a leakage channel, but opens and closes on demand.
What is a gated channel that opens/closes in response to a voltage change in the membrane? Voltage gated channel
What causes a resting membrane potential? More pos ions outside the membrane, more - inside
What is an action potential? a sequence of events that rapidly reverse or decrease a resting membrane potential
What is a threshold? When a nerve is stimulated to a threshold, it begins a chain reaction of opening gated channels, allowing for depolarization of the membrane.
What is a repolarization? A short period of time following a depolarization when the gated channels return to normal, and the resting membrane potential is reconstructed
What is the all-or-none principle? A nerve will not conduct an impulse at all unless the threshold is met, no partial impulse is possible.
Created by: russcrick
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