Dr. Brainy decides to make a new cell that ONLY has one ion channel in its membrane.This channel is a non-specific cation channel that is permeable to both sodium andpotassium, but not other ions. This non-selective cation channel is open at rest. Shemeasures the concentration of sodium and potassium ions and finds:SodiumPotassiumInsideOutsideEquilibrium Potential1mM10mM+58mV10mM1mM-58mVDr. Brainy measures the membrane potential and finds that :the resting membrane potential will approach 0 mV because K+ and Na+ ions repelone another in the pore of the channel, leading to no flow of ions through thischannel.the resting membrane potential will be negative because the driving force onpotassium to leave the cell is much greater than the driving force on sodium toenter the cellthe resting membrane potential is positive because K+ ions are larger than sodiumions and block the entry of sodium into the cellthe resting membrane potential will approach 0 mV because K+ ion efflux is equallybalanced with Na+ ion influx

Based on the conditions, let's evaluate the potential outcomes: Membrane potential approaching 0 mV:…

Answered: Dr. Brainy decides to make a new cell…

Biomedical Instrumentation Systems

1st Edition

ISBN:9781133478294

Author:Chatterjee

Publisher:Chatterjee

Chapter6: Biomedical Electrodes, Sensors, And Transducers

Section: Chapter Questions

Problem 6P

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Similar questions

A cell biologist is performing an experiment using the voltage clamp method in which they are allowed to change the voltage in the membrane potential. They are wanting to record potassium currents and notice that for a certain membrane potential range, the voltage clamp highlights that there is an inward current of potassium. Would these readings make sense?
If sodium permeability were to increase compared to normal what would be the resulting effect on the membrane potential 1.The charge on the inside of the cell becomes less negative compared to resting conditions and hyperpolarizes 2.The charge on the inside of the cell becomes more negative compared to resting conditions and hyperpolarizes 3.The charge on the inside of the cell becomes less negative compared to resting conditions and depolarizes 4.The charge on the inside of the cell becomes more negative compared to resting conditions and depolarizes
Which of the following intracellular potentials would have the greatest electrical attraction for Na+ to enter the cell? -70mV Ⓒ) -100mV -50mV OmV +20mV
There are differences in Na+, K+, and Cl- ion concentrations across the membrane. Knowing that ions like to flow down their respective concentration gradients explain how the movement of Cl- and K+ ions can result in membrane hyperpolarization.
The membrane potential for an excitable cell membrane is -70 mV, for sodium ions the Nernst equilibrium potential is +50 mV, the conductivity of the single sodium channel is 10 pS. What is the electrochemical potential difference that is the driving force for sodium ions to migrate? How much current flows through an open sodium channel under these conditions?
If potassium permeability increases the cell depolarizes the cell hyperpolarizes voltage gated ion channels open an action potential occurs more than one of the above is correct
The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential.
The resting potential of most cells is most dependent concentration gradient of: on the transmembrane Chloride Sodium Potassium Calcium
if an object b has a plasma sodium concentration of 135mOsm/L and an intracellular concentration of 4mOsm/L. It also has a plasma concentration of potassium of 20mOsm/L and an intracellular concentration of 200mOsm/L. studies identify that the cells have a permeability to potassium that is 10 times greater than sodium. What is the resting membrane potential
Which of the following phases of an action potential is correctly matched with the changes in ion movement and membrane potential? All of these are correctly matched. Phase 1 – sodium movement into the cell Phase 3 – potassium movement into the cell Phase 2 – sodium movement out of the cell
Voltage-gated K+ channel senses voltage across the plasma membrane and permits selective passage of K+ ions. True False
why do sodium ions need channels in order to move into and out of cells?

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