Which of the following actions is paired INCORRECTLY with its numbered position on the graph? Which of the following actions is paired INCORRECTLY with its numbered position on the graph?5030Restingpotential-40Threshold50-*****-...... .--60Undershoot-70O a.All of the options are correct.O b. Position 1 - Leak channels create the resting membrane potential.c. Position 4 - Voltage gated potassium channels are open.d. Position 5- All gated channels are closed.O e.Position 2 - Activation gates of some sodium channels are open and their inactivation loops are out.O O O

Channel proteins aid in the entrance and departure of substances within the cell. Channel proteins…

Which of the following actions is paired INCORRECTLY with its numbered position on the graph? 501 30 Resting potential -40 Threshold -50 -60 Undershoot -70 a. All of the options are correct. Position 1- Leak channels create the resting membrane potential. O c. Position 4 - Voltage gated potassium channels are open. O d. Position 5 - All gated channels are closed. O e. Position 2- Activation gates of some sodium channels are open and their inactivation loops are out.

Which of the following actions is paired INCORRECTLY with its numbered position on the graph? 501 30 Resting potential -40 Threshold -50 -60 Undershoot -70 a. All of the options are correct. Position 1- Leak channels create the resting membrane potential. O c. Position 4 - Voltage gated potassium channels are open. O d. Position 5 - All gated channels are closed. O e. Position 2- Activation gates of some sodium channels are open and their inactivation loops are out.

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 1SQE: Answer the following questions regarding conduction of action potentials using the velocities given...

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Please answer both 1) What is responsible for returning the cell to its normal resting membrane potential following the absolute refractory period? a) K+ leak channels b) the Na+/K+ pump c) activation of voltage-gated Na+ channels d) a ligand binding to a ligand-gated Na+ channel 2) What property of an action potential allows it to propagate? a) the rapid period of depolarization b) the rapid period of repolarization c) the brief period of hyperpolarization d) the fact that the peak is 85 mV above threshold
Nerve membrane hyperpolarization after an action potential a)Is the movement of membrane potential voltage below normal resting potential voltage. b) This Is mostly due to the slow-closing of K+ channels. c)Makes it more difficult to evoke another action potential. d) This Is mostly due to the slow-closing of Na+ channels.
The resting membrane potential of a neuron or muscle cell is a. equal to the potassium equilibrium potential. b. equal to the sodium equilibrium potential. c. somewhat less negative than the potassium equilibrium potential. d. somewhat more positive than the sodium equilibrium potential. e. not changed by stimulation.
3. Suppose you discover a chemical that can block leak potassium channels. What might happen as a result of this blockage? A) Na might have a larger influence on resting potential B) All of the answers are correct C) The Na/K pump activity might slow D) K would become less permeable
Which of the following statements is TRUE of the action potential? A. At the peak of the action potential there are approximately an equal amount of open voltage gated sodium and potassium channels B. To reach threshold the action potential requires the activity of sodium potassium pump C. During the rising phase (prior to the peak) of the action potential more voltage gated sodium channels are open than voltage gated potassium channels D. None of the choice options are TRUE of the action potential E. The overshoot phase (below resting membrane potential) is a result of voltage gated sodium channels taking a long time to close.
Assume a neuron's membrane potential is -60 mV, what's the net consequence on the membrane potential of a 5 picoamp (pA) sodium current that occurs simultaneously with a 5 pA chloride current? a. There's a 5 pA hyperpolarizing current b. There's a 10 pA depolarizing current c. There's a 10 pA hyperpolarizing current d. There's a 5 pA depolarizing current e. There's no change in the membrane potential
3) Neurons cannot respond during the absolute refractory period because: a) the concentration gradients for Na+ and K+ are reversed. b) the cell is below its normal resting membrane potential. c) voltage-gated Na+ channel activation gates are closed. d) voltage-gated Na+ channel inactivation gates are closed.
1) When threshold (-55 mV) is reached: a) voltage-gated K+ channels immediately open. b) Na+ enters through voltage-gated channels. c) the inactivation gate on Na+ channels opens. d) K+ leak channels close. 2) At the peak of an action potential (choose the two correct answers): a) voltage-gated K+ channels are open. b) K+ leak channels close. c) voltage-gated Na+ channels inactivate. d) voltage-gated Na+ channels close.
Which best defines depolarization? A. At first polarity is reversed the continues until the potential difference across the membrane is eliminated. B.None C.It reestablishes the resting potential. D. At first eliminates the potential difference across the membrane then continues until the polarity is actually reversed.
1.) In an experiment you artificially cut in half (~50% reduction) the number of voltage gated sodium channels that are located on the membrane of the axon hillock. Which of the following is the most likely result of this experimental manipulation? A. Summation of more IPSPs would be required for an action potential to occur B. This change would have no effect on the value required to reach threshold C. Even with a very large number of summating EPSPs it would be impossible for an action potential to occur D. The value to reach threshold would be higher (more positive) making it less likely for an action potential to occur E. All of the above statements are FALSE
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.
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.