Which of the following situations is correct for a neuron at its resting membrane potential? The concentrations of Cl- and K+ will be high on the outside, while the concentration of Na+ will be high on the inside O The concentration of K+ and Na+ ions will be high on the inside, while the concentration of Cl- ions is low on the inside The concentrations of Cl- and Na+ will be high on the outside, while the concentration of K+ will be low on the outside The concentration of Na+ and Cl- will be high on the outside, while the concentration of K+ will be high on the inside

Which of the following situations is correct for a neuron at its resting membrane potential? The concentrations of Cl- and K+ will be high on the outside, while the concentration of Na+ will be high on the inside O The concentration of K+ and Na+ ions will be high on the inside, while the concentration of Cl- ions is low on the inside The concentrations of Cl- and Na+ will be high on the outside, while the concentration of K+ will be low on the outside The concentration of Na+ and Cl- will be high on the outside, while the concentration of K+ will be high on the inside

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 2SQE

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Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.
Describe the contribution of each of the following to the establishment and maintenance of membrane potential: Part A Na+K+ Pump Passive movement of K+ across the membrane Passive movement of Na+ across the membrane Part B Resting membrane potential is approximately -70mV. Explain what resting membrane potential is and what -70mV refers to.
Compare the resting membrane potential of a neuron with the potassium and sodium equilibrium potentials. Explain how this comparison relates to the relative permeabilities of the resting plasma membrane to these two ions.
If action potential propagation from one neuron to another neuron requires ACh release, what event at the synaptic cleft explains the need for action potentials to arrive at a high rate before the post-synaptic membrane achieves threshold? the lack of sodium voltage gated channels on the post-synaptic membrane O the rapid breakdown of ACh by ACHE at the synaptic cleft the slow release of ACh by the synaptic vessicles the slow movement of sodium through chemical gates Previous Next MacBook Air
Which of the following statements is correct with regard to ionic concentrations at the normal resting membrane potential? O lower sodium, and higher potassium and chloride inside relative to outside of neurons. () higher sodium and potassium, and lower chloride inside relative to outside of neurons. lower sodium and chloride, and higher potassium inside relative to outside neurons lower sodium, potassium, and chloride inside relative to outside of neurons.
What is the equilibrium membrane potential due to Na+ ions if the extracellular concentration of Na+ ions is 154 mM and the intracellular concentration of Na+ ions is 27 mM at 20 ∘C ? Please answer asap and in short and content should not be palgarised please
Repolarization occurs because Multiple Choice more sodium ions diffuse into the cell than potassium ions diffuse out of it. potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close. the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level. the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value. the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases.
The above depolarization of a neuron will result in which of the following ionic currents? a potassium current will transport K+ ions out of the cytoplasm a sodium current will transport Na+ ions out of the cytoplasm a potassium current will transport K+ ions into the cytoplasm a sodium current will transport K+ ions out of the cytoplasm E. a sodium current will transport Na+ ions into the cytoplasm
At the peak of an action potential, would the relative permeability of Na be higher than K? Which ion would be the least permeable to the membrane during falling phase?
Which is TRUE about neuronal membrane electrical and concentration gradients at the peak of the action potential? The electrical gradient is in a direction that would tend to move K+ out of the cell. The concentration gradient for K+ is in a direction that would tend to move it into the cell. O The concentration gradient for K+ greatly increases compared to at rest. The concentration gradient for Na+ is in a direction that would tend to move it out of the cell. O The electrical gradient for Na+ is in a direction that would tend to move it into the cell.
At resting membrane potential for a typical neuron (-70 mV), which ion does NOT move?Na+Ca2+K+Cl-None
Assume the membrane is only permeable to Na+ and K+, the electrical model of axon membrane is the following: Outside A INa gna ENa Ex D Inside The membrane potential at rest and at peak is -70mV and 45mV respectively; the potential of Sodium ion is 60mV and the potential of Potassium ion is -80mV. Find the ratio 9Na at rest and at peak. gK