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Neurons have a resting membrane potential of approximately -70mV.
Muscle cells have a resting membrane potential of approximately -90mV.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoIt is -70 millivolts.
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What ion determines the resting membrane potential of nerve and muscle?
The concentrations on Na+ outside the cell and concentrations of K+ inside the cell determine the resting membrane potential.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
What are two factors that help maintain the resting membrane potential of a typical nerve cell?
Yes, some quantity of energy is needed to maintain and develop resting potential of cell's membrane during the stages 1 and 2 of resting potential forming Cell uses energy of ATP at these stages for sodium potassium pump to create difference in K and Na ion concentration inside the cell and outside. For transportation 2 ions of potassium inside and 3 sodium ions outside the cell one molecule of ATP is needed
Influx of Na plus till 70mV?
The electrical potential difference across a cell membrane (the resting potential) is around -65 mV, inside negative. In nerve cells (neurones) or muscle cells this potential difference is reversed during an action potential. Sodium (Na+) channels open and Na+ ions enter the cell down their concentration gradient. This entry of positive charge depolarises the membrane ie it cancels out the resting pootential and then reverses it, so the potential becomes positive inside and negative outside, giving a potential of about +50mV.
What is the resting potential and how is it created and maintained?
The resting potential is the voltage inside the neuron cell membrane of about -70 mV (negative 70 millivolts). This electrical potential (separation of charges) is made possible by an imbalance in sodium (positive), potassium (positive), and chloride (negative) ions on each side of the neural membrane. In the case of the resting potential, the surplus of chloride ions and relative deficiency of sodium/potassium ions within the neuron, relative to the outside of the neuron, give a charge difference of 70 millivolts, making the inside of the neuron more negative than the outside.There are ion channels that open and close based on voltages and other factors that are embedded in the neuron's cell membrane. When triggered by a nerve impulse, they open to allow for positive ions to stream into the nerve, which depolarizes it to generate the "signal".After the signal passes, the neuron resets itself by opening ion channels that pump positive ions back out of the neuron, and pump negative ions back in, in order to readjust to the resting potential again.
What is a nerve membrane at rest called?
When the neural membrane (neurolemma) is at rest it is said to have resting potential, polarized, and has a negative charge inside.
When a resting nerve fiber is polarized sodium and potassium ions is higher on the inside of its membrane?
A resting nerve fiber is polarized because the concentration ofNa+ is higher on the outside and K+ is higher on the inside.
When the nerve is at rest the inside charge is?
negative
What ion determines the resting membrane potential of nerve and muscle?
The concentrations on Na+ outside the cell and concentrations of K+ inside the cell determine the resting membrane potential.
How is a resting potential achieved in the nervous system?
The resting nerve cell is not being stimulated to send a nerve impulse
Why is the term action potential used to describe a nerve impulse?
It is a difference in charge supplied by ion position. In resting potential the tendency is for the inside of the cell membrane to have a negative ionic charge, while the outside of the membrane has a positive charge. The change, back and forth in these two charge potentials is the conduction of charge down the neuron and is called the action potential.
How the maintenance of a polarized state in a resting nerve is provided?
Maintenance of a polarized state of a resting nerve is achieved through continuous expenditure of energy.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
A sodium channel blocker would increasedecreaseserum sodium levels outside of normal resting nerve cells?
a sodium channel blocker would (increase;decrease) serum sodium levels outside of normal resting nerve cells
What are two factors that help maintain the resting membrane potential of a typical nerve cell?
Yes, some quantity of energy is needed to maintain and develop resting potential of cell's membrane during the stages 1 and 2 of resting potential forming Cell uses energy of ATP at these stages for sodium potassium pump to create difference in K and Na ion concentration inside the cell and outside. For transportation 2 ions of potassium inside and 3 sodium ions outside the cell one molecule of ATP is needed
What is depolarizing?
loss of polarization; especially : loss of the difference in charge between the inside and outside of the plasma membrane of a muscle or nerve cell due to a change in permeability and migration of sodium ions to the interior
Influx of Na plus till 70mV?
The electrical potential difference across a cell membrane (the resting potential) is around -65 mV, inside negative. In nerve cells (neurones) or muscle cells this potential difference is reversed during an action potential. Sodium (Na+) channels open and Na+ ions enter the cell down their concentration gradient. This entry of positive charge depolarises the membrane ie it cancels out the resting pootential and then reverses it, so the potential becomes positive inside and negative outside, giving a potential of about +50mV.
