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The repolarization phase of the action potential where voltage becomes more negative after the plus 30mV peak?
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∙ 9y ago
K+ ions leaving the cell through voltage-gated channels
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∙ 9y ago
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During an action potential hyperpolarization beyond more negative to the resting membrane potential is primarily due to?
Potential hyperpolarization are more negative to the resting membrane potential because of voltage. This is taught in biology.
What would happen to the membrane potential if a substance that makes the membrane permeable to ions is added to the cell?
If a subsance is applied to a cell that makes the membrane more permeable to ions, the interior voltage changes. If the interior voltage becomes more positive (say from Ð70 mV to Ð60 mV), this is called a depolarization. If the interior voltage becomes more negative (say from Ð70 mV to Ð80 mV) it's called a hyperpolarization.
Why is it possible to measure an electric potential across the terminals of a dry cell?
Batteries are a voltage storage device that hold a voltage potential until used. By using a volt meter you can find the stored voltage by placing the leads of the meter across the battery's positive and negative terminals.
Do potassium channels open and sodium channels close during repolarization phase of the action potential?
They both stay open.If sodium channels were to remain closed, there wouldn't be any repolarization. The Potassium concentration gradient would keep pumping Potassium ions out of the cell and the Potassium electrical gradient would drive Potassium ions into the cell, thus maintaining the equilibrium potential of -90 mV.No repolarization would occur if the sodium channels are closed.The above is not correct.During the depolarization phase, BOTH VOLTAGE-GATED SODIUM & POTASSIUM channels open.Once the cell reaches close to sodium's equilibrium potential, the VOLTAGE-GATED sodium channel closes.The VOLTAGE-GATED potassium channel opens around this time(The voltage gated potassium channel is very slow to open; it fully opens around the same time the voltage gated sodium channel closes) causing repolarization.The cell experiences hyperpolarization because the voltage gated potassium is also slow to close.Once fully closed, the cell depolarizes back to resting potential.Also, the picture is a picture of the AP in cardiac muscle which differ from skeletal muscle.The plateau is due to voltage-gated calcium channel that opens during the AP.
What is primarily responsible for the brief hyperpolarization near the end of the action potential?
voltage-gated potassium channels taking some time to close in response to the negative membrane potential
How do you find the voltage at a point in a circuit with respect to a negative voltage?
First of all, 'voltage' means potential difference -and you cannot have a potential difference 'at a point'. Similarly, you cannot have a 'negative' potential difference, so it doesn't make sense to talk about a 'negative voltage'.Your question, therefore, should read: 'How do you find the potential at a point in a circuit with respect to a negative potential?'The answer is that you simply connect a voltmeter between the two points. The reading will give you the value of the potential. If it reads upscale, then it'll be positive; if it reads downscale, then it will be negative (i.e. even more negative tan the reference potential).
What is a positive DC voltage?
A positive DC voltage is an electric potential where excess electrons will flow from negative to positive.AnswerYou appear to be mixing up potential difference (i.e. voltage) with potential. There is no such thing as a 'positive' voltage if you mean 'positive' in the sense of charge! 'Voltage' means 'potential difference', and you cannot have a positive or negative potential difference in this sense. You can only apply positive and negative in this sense to potentials.However, if you mean 'positive' in the sense of direction, then a positive voltage is one that is acting in the opposite direction to a negative voltage within the same circuit. For example, where two batteries have been connected in opposition.
What does a negative cell voltage mean?
The reaction is spontaneous.
What is it called when positive and negative charges have a potential difference?
Voltage.
How can you get negative voltage?
Your question should read "How do you get a negative potential?", for the reasons explained below.The term, 'voltage', is another word for 'potential difference'. The terms 'positive' and 'negative', when applied to a potential difference or voltage indicates the sense (or direction) in which the potential difference or voltage is acting. For example, if a second voltage is acting in the same direction as another voltage then it is acting in the positive sense; if it is acting in the opposite direction then in is acting in the negative sense'.It's very important to understand that you cannot apply 'positive' and 'negative' is the sense of charge or polarity to potential difference or voltage. You can, however, apply these terms to 'potential'. Potential is relative, and always measured with respect to a given point (often, the earth). So a point can be, for example, +5 V or -5 V with respect to another point (usually earth or ground, but not necessarily).Never confuse 'potential' with 'potential difference' and remember that 'voltage' means potential difference notpotential.So, to obtain a negative potential, earth (ground) the positive terminal of the battery or d.c. supply. All potentials measured relative to earth are now negative. To obtain a positive potential, earth the negative terminal of the battery or d.c. supply instead. All potentials measured relative to earth are now positive.If you want to get a negative potential,Earth the positive terminal of the DC power sourceConnect a resistor in series with the negative terminal of the sourceAt the other end of the resistor you get a negative potential (the value's less than the value of the power supply)
What is negative ac voltage?
Negative voltage is voltage that is more negative in polarity than the ground of the circuit.AnswerSince 'voltage' is simply another word for 'potential difference', it can be neither negative or positive in the 'charge' sense! These terms can only be applied to 'potential', not to 'potential difference' (voltage).So, the terms 'positive' and 'negative', when applied to voltage, simply indicate sense or direction in which the potential difference is acting. For example, if you decide that a car battery's voltage is acting in the 'positive' sense in the charging circuit, then the alternator's voltage must then be acting in the 'negative' sense -in other words in the opposite direction to the battery.
Why the dc average voltage is having negative value?
Voltage is synonymous with 'potential difference', and cannot have a positive or negative value (in the sense of charge). So what you are describing is 'potential', which can. So, for example, a battery whose positive terminal is earthed or grounded will indicate a negative potential if a voltmeter is connected between earth and its negative terminal.
During an action potential hyperpolarization beyond more negative to the resting membrane potential is primarily due to?
Potential hyperpolarization are more negative to the resting membrane potential because of voltage. This is taught in biology.
What is the mechanism that restores the resting membrane voltage and intracellular ionic concentration?
repolarization
What is programmable output in voltage regulators?
A: The output voltage a 7805 can becomes a 1 voltage regulator of higher voltage the 5 volts if so chosen. However it can never becomes less then 5 volts not unless a negative voltage source is found.
What is potential drop?
There is no difference between potential difference and potential drop. Both terms refer to the difference in voltage (i.e. potential) across a component. Depending on how you look at it, both terms can refer to positive or negative differences, i.e. drop, for instance, can be negative, implying a rise.
Why is negative voltage given in bently Nevada vibration probe?
be couse it is bantly neveda monopoly used on based of npn transistorsAnswerThere is no such thing as a negative voltage, in the sense you mean -the word you are looking for is negative 'potential'.
