When opened, the ligand-gated cation channels do not allow diffusion of Cl-because :-a- the size of Cl- is bigger than the bore of the channelsb- intracellular negativity causes complete inhibition of Cl- influxc- the channels are specific for diffusion of Na + onlyd- the inner surface of the channels is negatively charged

When opened, the ligand-gated cation channels do not allow diffusion of Cl-because :-a- the size of Cl- is bigger than the bore of the channelsb- intracellular negativity causes complete inhibition of Cl- influxc- the channels are specific for diffusion of Na + onlyd- the inner surface of the channels is negatively charged

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 17RE

See similar textbooks

Similar questions

IPSP could result from :-a- opening of K + channelsb- opening of ligand-gated cation channelsc- closure of Cl- channelsd- closure of potential-gated Ca ++ channels
You attempt to generate an IV plot for GABA channels in cultured neurons. You apply pentobarbital and perform voltage steps but see no current at any voltage. Which of the following would explain your findings? Concentration of pentobarbital is too low GABA is not present in your solutions Cl- concentration is equal on both sides of the membrane None of the above
Which of the following statements best describes the features of voltage-gated K+ channels? They consist of 4 subunits, are activated at the same time as voltage-gated Na+ channels, but do not inactivate. They consist of 4 subunits, are activated by depolarisation and close slowly during the refractory period. They have 24 membrane spanning alpha helices, 4 of which have positively charged amino acids which promote a conformational change in the channel following depolarisation. They consist of 4 subunits and are open at rest which causes the resting membrane potential to be close to the K+ equilibrium potential.
Which statement is TRUE regarding the Na+ voltage-gated channel in neurons? A) Similar to the potassium ion channel, it exists as a tetramer in the membrane. B) Aspartate residues are part of the voltage-sensing helices. C) Positive membrane potentials on the extracellular side will close the channel. D) Ion specificity comes from the voltage-sensing helices.
The reason that resting membrane potential (RMP) is closer to the equilibrium potential of K+ (EK) rather than that of Na+ (ENa) is that… Group of answer choices -The driving force for Na+ ions at rest is high. -The membrane is much more permeable to Na+ ions than K+ ions at rest. -Only K+ ions have a concentration gradient, Na+ ions have approximately equal intracellular and extracellular concentrations -The membrane is much more permeable to K+ ions than Na+ ions at rest.
Voltage-gated Na+ channels are.... (select all that apply). Group of answer choices: A. Opened by the presence of negative charge B. Opened by the presence of positive charge C. Always open D. Gated
A sodium channel in a nerve membrane a)Inactivation gate closes when the membrane reaches ~+30 mV. b)Opens and closes quickly. c)Activation gate opens when the membrane reaches threshold voltage. d)'Resets' when the membrane reaches resting potential .
Please ASAP. thanku The response of ligand gated ion channels is transient because ___ (can choose more than one option) a. ligand unbinds and is claered from teh synapse quickly b. the channels desensitize c. the cahnnels inactivate d. amino terminus is truncated
Finally, what will be the effect on the membrane potential if K+ loan move out of the cell?a) K+ will bring the membrane potential to 0 (neutral) b) The membrane potential won't be significantly affected (non-polarizing) c) K+ leaving will make the inside of the cell more negative (hyperpolarizing) d) K+ will make the inside of the cell more positive (depolarizing)
Which of the following is the correct statement regarding ion channels? Physical deformation of the membrane cannot open ion channels Ligand-gating means that an ion binds to the channel, which stimulates its opening. If the channel pore was the right size, Na and K could both pass through because they have the same charge A voltage gated Na channel can open to allow Na movement against its electrochemical gradient
The resting membrane potential…A) Can be approximated using the Nernst equation.B) Is established by a difference in charges across the cell membrane, with the inside more positive than the outside.C) Has no influence on the driving force for flow of a particular ion across the cell membrane.D) Is more dependent on the passive flow of potassium vs. sodium ions through leak channels across the cell membrane.E) Stays the same during an action potential.
1.A poison causes a drastic rise inE value with stimulation of the membrane.Thereafter membrane is slow to return towards resting membrane potential and levels off several millivolts above the threshold potential. This poison has likely affect which feature of the membrane? a) voltage gated na+ channels. b) voltage gated K+ channels. c) Na+/K+ Atp pump 2. All cell membrane demonstrate action potential if stimulated enough? True/False. 3. how many peaks are there in a compound action potential? a)2. b)4 c)6 d)8 4. Increasing the ionic concentration in the salt bridge results in E value increase to a point after which it plateeus. This is evidence brownian movement at work in the ionic solution that is keeping from energy flowing through the bridge with the fidelity that is seen in the metal bridge? True/ False 5. All cell membrane demonstrate action potential if stimulated enough? True or False.