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19 Cards in this Set
- Front
- Back
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Membrane Potential |
Difference in a voltage across cell membrane |
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MP is due to? |
Ion concentration differences across cell membrane |
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Difference in distribution is due to? |
Selective permeability of membrane, diffusion and active transport |
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Ion channel |
Protein that allows a specific ion to cross the cell membrane |
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Types of ion channels |
Ungated, gated, voltage gated, chemically gated, mechanical pressure and light |
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RMP |
MP of a cell is in an unstimulated resting state |
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Creation of RMP |
Large negative proteins trapped inside a cell, membrane permeability to sodium and potassium |
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Excitable Cells |
Muscle and nerve cells. Only a few can alter the member potential in response to stimulation |
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Depolarization |
Membrane potential becomes more positive |
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Hyperpolarization |
Membrane potential becomes more negative |
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Repolarization |
Restores RMP |
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Graded potential |
Small deviation from RMP caused by stimulus |
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Action Potential |
Sequence of rapid depolarization and repolarization due to opening of voltage gated ion channels |
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Types of fibers |
Type A large diameter myelinated type B medium diameter myelinated type C small unmyelinated |
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Speed variations of cell to cell |
Diameter, nerve, muscle, my elongated and unmyelinated |
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Salutatory conduction |
Impulse jumps from one node of ranvier to the next |
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Nodes of ranvier |
Gaps in myelin sheath |
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What type of channels do K+have |
Both gates and ungated |
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Type of Na+ channels |
Gated and closed |
