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Potassium and sodium determine the a cell's resting membrane potential. The equilibrium potential (the voltage where no ion would flow) for sodium is about +60 mV while that for potassium is usually around -80 mV, but because the resting cell membrane is approximately 75 times more permeable to potassium than to sodium, the resting potential is closer the the equilibrium potential of potassium. This is because potassium leak channels are always open while sodium come in through voltage gated or ligand gated channels.
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∙ 11y ago
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∙ 14y agoCl, Na, and K work through osmosis, and the sodium-potassium pump to create equilibrium in the cell, and thus the resting potential.
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∙ 13y ago2 Potassium (K+) ions in, 3 sodium (Na+) ions out
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∙ 12y agoInside the cell, potassium is at its highest concentration during resting membrane potential.
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∙ 12y agoPotassium and sodium
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What transport mechanism might be used to prevent the movement of sodium ions into the cell when it is at resting potential?
Passive transport - i.e., "leaky conductance" provided by NLCN channels for example.
How does a neuron restore a membrane potential following the generation of an action potential?
The hyperpolarization of the membrane potential relative to the resting potential (the undershoot) causes voltage-dependent Potassium conductance (and any Sodium channels not yet inactivated) to turn off, allowing the membrane potential to return to resting level.
How electrical signal exist related with membrane potential and and action potential?
Resting potential and action potential are both names for the measure of electrical voltage within the membrane of a cell. Specifically, these terms are used in describing the transfer of information along neural pathways. Resting potential is a state where cells are at rest. However, if an electrical response or depolarization reaches threshold, then ion channels open, allowing sodium ions to rush into the membrane and increase the voltage measure, firing an action potential along the length of this membrane.
What is the electrical charge of an action potential?
The electrical potential of the cell body changes during an action potential from a negative potential of around -70 mV to a positive potential of +40 mV. The resting potential, however, remains constant.
What rule of thumb is used to determine to charge on non metal ions?
metals generally form positively charged ions
Which transport mechanism might be used to prevent the movement of sodium ions intovthe cell when it is at resting potential?
Passive Transport
What transport mechanism is used to prevent to movement of sodium ions into the cell when it is at resting potential?
Passive transport - i.e., "leaky conductance" provided by NLCN channels for example.
What transport mechanism might be used to prevent the movement of sodium ions into the cell when it is at resting potential?
Passive transport - i.e., "leaky conductance" provided by NLCN channels for example.
How does a neuron restore a membrane potential following the generation of an action potential?
The hyperpolarization of the membrane potential relative to the resting potential (the undershoot) causes voltage-dependent Potassium conductance (and any Sodium channels not yet inactivated) to turn off, allowing the membrane potential to return to resting level.
How are potential and action potential related?
Resting potential and action potential are both names for the measure of electrical voltage within the membrane of a cell. Specifically, these terms are used in describing the transfer of information along neural pathways. Resting potential is a state where cells are at rest. However, if an electrical response or depolarization reaches threshold, then ion channels open, allowing sodium ions to rush into the membrane and increase the voltage measure, firing an action potential along the length of this membrane.
How electrical signal exist related with membrane potential and and action potential?
Resting potential and action potential are both names for the measure of electrical voltage within the membrane of a cell. Specifically, these terms are used in describing the transfer of information along neural pathways. Resting potential is a state where cells are at rest. However, if an electrical response or depolarization reaches threshold, then ion channels open, allowing sodium ions to rush into the membrane and increase the voltage measure, firing an action potential along the length of this membrane.
What is the process by which ATP is used to move sodium ions out of the cell and potassium ions back into the cell and completely restores the resting conditions of the neuron?
repolarization
What is the electrical charge of an action potential?
The electrical potential of the cell body changes during an action potential from a negative potential of around -70 mV to a positive potential of +40 mV. The resting potential, however, remains constant.
The role of the sodium potassium pump in maintaining a cells resting membrane potential?
The relative concentration of sodium (Na+) and potassium (K+) in the neuron with respect to their concentration in the extracellular space is what causes the electrical potential and the differential concentration is established by a Na-K Atpase which exudes sodium and transports potassium into the neuron.
What deflects the ions?
In a mass spectrometer, the magnetic field is used to deflect ions.
What is the physical standard used to establish the length of a second?
a crystal when cut to specific dimensions will vibrate at a particular frequency when an electric potential is applied across it. The length of the second is standardized by the Cs crystal.
How are radioisotopes used in agriculture?
Radioisotope labelled metal ions can be used to examine the availability of different fertilizer components for use by the crops. Similarly mercury or some other undesirable substances can be applied. If the crops take up the label then it shows a potential problem.
