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How would a change in Na plus conductance affect resting membrane potential?
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What affect does elevated extracellular chloride have on the resting membrane potential of a neuron?
Not much. Changing the extracellular chloride changes the level inside the cell so they will be in equilibrium again. The chloride ion plays little role in resting potential.
What influences the movement of ions and molecules across cell membranes?
A membrane potential is basically the difference between the inside and outside of the cell. Ions are charged, and so will change the membrane potential (the difference between charges on the inside and outside) when they move. Please see the related link below which includes a diagram of how ions affect membrane potential.
What affect does lowering extracellular calcium have on the resting membrane potential of a neuron?
Low calcium levels in the extracellular fluid increase the permeability of neuronal membranes to sodium ions, causing a progressive depolarization, which increases the possibility of action potentials. These action potentials may be spontaneously generated, causing contraction of skeletal muscles (tetany).
How does the concentration of electrolytes affect the conductivity of a solute?
The conductance of a given conductor, C = La/l ..(i)\ L = l/Ra ..(ii)The resistance is expressed in units of ohm, the conductance has units of ohm-1 or mho.The conductance of solutions is also governed by the same relations. From (i), if l = 1,a = 1, the specific conductance L = C. That is,the specific conductance (L) is the conductance of the solution enclosed between two electrodes of 1 sq. cm area and 1 cm apart. when you dilute the solution the concentration decrease and the specific conductance also decreaseThe conductance of a solution depends upon the number of ions present and hence on the concentration. To compare the conductivity of different solutions, it is necessary to take the concentration of the solutions into consideration. It is done by using equivalentconductance, l.
How does opening a gated ion channel affect resting membrane potential?
Since the concentration gradient is very large for potassium (where the concentration is much greater ( ~20-30X) inside the cell than outside the cell), reducing this concentration gradient by increasing the concentration of extracellular potassium would result in decreased efflux of potassium through leak channels. This decrease in efflux would result in immediate depolarization of the cell membrane, and would probably be sufficient to generate an action potential (if the depolarization met the threshold level of ~55mV). Now this would only apply to the first generation of an action potential, because if the cell were not able to restore its resting membrane potential (as in the case of increased XC potassium), no subsequent action potentials would be generated. Remember that eventually, equilibrium would be reached between the concentrations of potassium inside and outside the cell, meaning no net flux of those ions, meaning no membrane potential.
How would depressants affect the resting membrane potential?
the conduction of neural information to the muscle fiber
Does the sodium or potassium pump provide energy for neurons but does not affect resting membrane potential?
False
What affect does elevated extracellular chloride have on the resting membrane potential of a neuron?
Not much. Changing the extracellular chloride changes the level inside the cell so they will be in equilibrium again. The chloride ion plays little role in resting potential.
How do stimulatory neurotransmitters affect the membrane potential of the postsynaptic membrane?
This really depends on the postsynaptic cell and the NT in question. Assuming you are talking about neuro-muscular interactions, the membrane potential moves from a more negative state to a more positive state.
What is stomata conductance?
Stomatal conductance is the speed at which water evaporates from pores in a plant, and is directly related to relative size of the stomatal apature. Basically, the higher the evaporation rate, the higher the conductance of the leaf. It must also be noted that humidity, the hydration status of the plant and light intensity are also factors that affect stomatal conductance.
What influences the movement of ions and molecules across cell membranes?
A membrane potential is basically the difference between the inside and outside of the cell. Ions are charged, and so will change the membrane potential (the difference between charges on the inside and outside) when they move. Please see the related link below which includes a diagram of how ions affect membrane potential.
What affect does lowering extracellular calcium have on the resting membrane potential of a neuron?
Low calcium levels in the extracellular fluid increase the permeability of neuronal membranes to sodium ions, causing a progressive depolarization, which increases the possibility of action potentials. These action potentials may be spontaneously generated, causing contraction of skeletal muscles (tetany).
How does the concentration of electrolytes affect the conductivity of a solute?
The conductance of a given conductor, C = La/l ..(i)\ L = l/Ra ..(ii)The resistance is expressed in units of ohm, the conductance has units of ohm-1 or mho.The conductance of solutions is also governed by the same relations. From (i), if l = 1,a = 1, the specific conductance L = C. That is,the specific conductance (L) is the conductance of the solution enclosed between two electrodes of 1 sq. cm area and 1 cm apart. when you dilute the solution the concentration decrease and the specific conductance also decreaseThe conductance of a solution depends upon the number of ions present and hence on the concentration. To compare the conductivity of different solutions, it is necessary to take the concentration of the solutions into consideration. It is done by using equivalentconductance, l.
Which of the following factors does not affect membrane permeability?
The polarity of membrane phospholipids -Mastering Biology
How does opening a gated ion channel affect resting membrane potential?
Since the concentration gradient is very large for potassium (where the concentration is much greater ( ~20-30X) inside the cell than outside the cell), reducing this concentration gradient by increasing the concentration of extracellular potassium would result in decreased efflux of potassium through leak channels. This decrease in efflux would result in immediate depolarization of the cell membrane, and would probably be sufficient to generate an action potential (if the depolarization met the threshold level of ~55mV). Now this would only apply to the first generation of an action potential, because if the cell were not able to restore its resting membrane potential (as in the case of increased XC potassium), no subsequent action potentials would be generated. Remember that eventually, equilibrium would be reached between the concentrations of potassium inside and outside the cell, meaning no net flux of those ions, meaning no membrane potential.
What can affect the amount of friction on an object?
the weight of the object, what its outside consists of, the nature of the surface it resting on.
What affect does increased calcium have on the resting membrane potential of a neuron?
The opposite of decreasing the level of calcium. It will be harder for the neuron to respond to a stimuli. It can have a negative effect on the heart rate and can mimic a heart attack. There is a mnemonic for remembering the effects of hypercalcaemia: "Stones, Bones, Groans, Thrones and Psychiatric Overtones". So it can affect all of these: Stones (renal or biliary) Bones (bone pain) Groans (abdominal pain, nausea and vomiting) Thrones (Osborn wave on ECG) Psychiatric overtones (Depression 30-40%, anxiety, cognitive dysfunction, insomnia, coma)
