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…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Similar questions

If: membrane potential=-70mV, ENa=+60mV, and Ex=-90mV, consider which directions Na+ and K+ will leak across the membrane. If both ions are crossing the membrane, what is the most important factor in determining whether membrane potential will become more positive or more negative?
If the resting membrane potential of a cell was +70 mV, the ELECTRICAL driving force on sodium would be: Group of answer choices into the neuron out of the neuron balanced
What is the difference between a ligand-gated channel (like H1 or the AChR) and a voltage gated channel?
Place the following events in chronological order from 1-8: Nat enters the cell, and depolarization occurs to approximately +30 mV. The voltage across the cell membrane is -70 mV, the resting membrane potential. Upon reaching the peak of the action potential, the VG Nat channels are inactivated by the closing of their inactivation gate and the activation gate of each VG K channel opens. VG K channels close by the closing of their activation gate, and the resting membrane potential is gradually restored. An excitatory post-synaptic potential depolarizes the membrane to threshold and the activation gate of VG Nat channels open. Upon returning to the resting membrane potential, VG Na channels are reset by opening of the inactivation gate and the closing of the activation gate. VG K+ channels are slow to close, resulting in an excess of K* efflux and hyperpolarization. Depolarization occurs as K+ flows out of the cell.
A change in membrane potential which is due to ion influx or efflux in a single region with the ions then diffusing away from that region is called a(n) ______
Match each type of membrane potential (resting, threshold, graded, or action) to its definition: a) The membrane potential at which voltage gated sodium channels open. b) The membrane potential that triggers the action potential. c) Change in membrane potential that may or may not reach threshold and that may be depolarizing or hyperpolarizing. d) Rapid, strong depolarization followed by immediate repolarization. This potential is self-renewing if the right ion channels are nearby.
The options for all 8 are either: Depolarization, Na+ influx into cell Vm=-70mV inactivation of voltage-gated Na+ channels and opening of voltage-gated K+ channels Vm = -55mV, voltage Gated Na+ channels open graded potentials stimulating depolarization at the axon hillock hyperpolarization Repolarization, K+ efflux out of cell cells return to resting membrane potential
Which of the following takes place during an action potential? Na+ ions exit the cell causing depolarization Repolarization occurs when K+ ions enter the cell The membrane becomes more negative during depolarization K+ ions start the action potentials Na+ enters the cell making the membrane potential positive.
Stimuli below this intensity will result in no response in a neuron. Resting Membrane Potential Electrical Threshold Repolarization Action potential
A resting cell's membrane is more permeable to K+ simply because: K has a higher atomic number than Na. The Na+/K+ ATPase only works in response to a stimulus. There are more voltage-gated K+ channels than voltage-gated Na+ channels in the cell membrane. There are more K+ leaky channels than Na+ leaky channels in the cell membrane.
What happens to the membrane potential when Na+/K+ pump is active?
Fill in the diagram, your illustration should demonstrate for each phase of the AP: 1. The relative concentration of K and Na 2. The relative voltage across the membrane 3. Any movement across the membrane of K and NA 4. The three kinds of channels in the membrane, and their state (open or closed) 5. Finally, indicate on the graph of the AP which phases correspond to hyper- polarization and which phases correspond to de- polarization Outside Outside Inside Inside Outside Inside Outside 1 Outside Inside Inside

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