In the maintenance of the cell resting membrane potential what happens?
extracellular sodium levels are high
If a membrane potential becomes more negative than the resting potential, the membrane is said to be what?
When the membrane potential becomes more negative it is being hyperpolarized. Remember the resting membrane potential is already at a negative state (~70mV). So if you are making a comparison of a membrane potential that is hyperpolarized in comparison to a resting membrane potential, the resting membrane potential is said to be more depolarized. When the membrane potential becomes more positive it is called depolarization.
During an action potential hyperpolarization beyond more negative to the resting membrane potential is primarily due to?
The resting membrane potential is important because it maintains a 'ready state' for the cell to fire. Without the resting membrane potential there would be no driving force for ions like sodium to enter the cell; and if this doesn't happen then the cell wouldn't be able to depolarise and fire an action potential
What would happen to a resting membrane potential if the sodium potassium transport pump was blocked?
The resting membrane potential difference between the inside and the outside of the cell is the result of selective permeability of the cell membrane and the active transport of ions into and out of the cell. Almost all cells have a potential difference, but some cells, neuron and heart muscle, also have voltage and chemically gated channels that allow for transient deviations from the resting potential.
What would happen to the resting membrane potential if the extracellular sodium concentration was decreased?
The resting membrane potential is the difference between the inside of the cell relative to the outside. The outside is always taken as 0mv. The resting membrane potential is negative because there is a higher concentration of potassium ions outside the cell (because the membrane is more permeable to potassium ions) than inside. Since potassium ions are positively charged this leads to a negative value.
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…
It is -70 millivolts. The resting potential of a neuron refers to the voltage difference across the plasma membrane of the cell, and is expressed as the voltage inside the membrane relative to the voltage outside the membrane. The typical resting potential voltage for a neuron is -70mV Resting potentials occur because of the difference in concentration of ions inside and outside of the cell, largely by K+ (Potassium ions) but some contribution is made…