The resting voltage of the cell membrane:O is a property of the cellO is generated by mechanically-gated channels, voltage-gatedchannels, and ligand-gated channelsO is defined by the difference in overall ionic charges betweenthe two sides of the membraneO has a negative value at rest in all cells except neuronsO all of the above

Cell membrane It refers to the biological membrane that is involved in the separation of the inside…

The resting voltage of the cell membrane: O is a property of the cell O is generated by mechanically-gated channels, voltage-gated channels, and ligand-gated channels is defined by the difference in overall ionic charges between the two sides of the membrane O has a negative value at rest in all cells except neurons O all of the above

The resting voltage of the cell membrane: O is a property of the cell O is generated by mechanically-gated channels, voltage-gated channels, and ligand-gated channels is defined by the difference in overall ionic charges between the two sides of the membrane O has a negative value at rest in all cells except neurons O all of the above

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

Section4.3: Action Potentials

Problem 2CYU

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mbing fiber depolarizes mbrane potential to en Ca2+ channels. tage-gated channel 2+ Ca²+ Release 2+ Ca²+ Endoplasmic reticulum removal of AMPA receptors from the postsynaptic membrane. insertion of AMPA receptors into the postsynaptic membrane O increase in intracellular Ca2+ via voltage-gated Ca2+ channels O DAG- and Ca2+-mediated activation of PKC increase in intracellular Ca2+ via endoplasmic reticulum IP3 receptors
The membrane voltage in graded potentials can be produced by Oopen channels and ligand-gated chanels Ovoltage-gated channels Oligand-gated and mechanically gated channels Oligand-gated channels mechanically gated channels
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.
Sodium (Na*) and Potassium (K+) are equally distributed across the neuronal membrane at resting membrane potential because of the: O Unassisted passive diffusion across the membrane O Nat/K+ Pump O Nongated Channels Voltage-gated Channels Chemically-gated Channels
Nervous Tissue electrical and chemical disequilibrium across cell membranes equilibrium potential calculating the equilibrium potential using the Nernst Equation The parameters of the Goldman Equation the reason for a -70mV resting'potential in most excitable cells gated channels particulars Defining depolarization, repolarization and hyperpolarization defining the role for the common ions, (K+, Na+ )special ions Cl, Ca+ have Define Current and ohm's law l=V/R Defining graded potentials and particulars about graded potentials such as subthreshold GP o suprathreshold GP temporal summation spatial summation e1 of 2 418 words English (United States) O Focus B I @ #3 24 & * 3 4 7 8
If the membrane potential of a neuron drops to -55mV and sodium ions start to flow from outside to inside the neuron at this moment. How much energy will be released or used up during this flow of sodium ions if the concentration of sodium ions outside and inside the membrane was 1.5 M and 0.75 M respectively.
Membrane permeability at the rising phase of an action potential is dominated by: O Co-transporters Nongated Channels O K+ Voltage-gated Channels O Na+ voltage-gated Channels O Chemically-gated Channels
What drives K+ ions through voltage gated channels while funny channels are also open? O pifference in K+ concentration across the PM O pressure potential O Both difference in K+ concentration across the PM and Membrane potential (difference in charge across the membrane) O Osmotic potential O Membrane potential (difference in charge across the membrane)
The interior of a neuron's plasma membrane at resting membrane potential will have a positive charge and contains less sodium than outside of the cell positive charge and contains more sodium than outside the cell negative charge and contains less sodium than outside the cell O negative charge and contains more sodium than outside the cell
Membrane Potential (mV) +35 0 -50 -70 0 A B C | 2 Time (milliseconds) 3 E 4 Use the figure showing phases of the action potential to answer the following question. Most of the voltage-gated sodium channels become open at label ____, and become inactivated at label
A drug specifically blocks the Na+/K+ ATPase pump. What effect might this have on the action potential? O It will shorten the duration of the action potential as there will not be as many ions available to cross the membrane. None, as action potentials rely on channels for Na+ and K+ to cross the membrane, not pumps. It will not have an immediate effect, but eventually action potentials will stop as the Na+ and K+ gradients are depleted. It will make action potentials more likely to occur as the pump normally makes the cell more negative, so without it the membrane will reach threshold more easily.
True and false - A k+ channel will be just as permeable to Na+ as to K+ because Na+ is a smaller ion - channel proteins are for small things like ions, not larger molecules like sugars - channel proteins have specificity by providing amino acid side chains to H bongs with particular ions in place of those ions binding with water -Ion channels all low ions to pass through in either direction depending on the electrochemical gradient of the ion - the free energy of an ion travelling across the plasma membrane depends completely on the ions concentration inside versus outside the cell