Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 48, Problem 6TYK
Summary Introduction
Introduction: In
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Which of the following primarily reflects the opening of voltage-gated Na+ channels?
A. The resting membrane potential
B. The depolarization phase of the action potential
C. The threshold potential
D. The repolarization phase of the action potential
E. All of the above
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.
Action potentials are normally initiated at the axon hillock because
a. there is a particularly high density of voltage-gated sodium channels there.
b. threshold potential is lower there than at other sites along the plasma membrane.
c. activation of sodium channels at the axon hillock results in a particularly strong inward current and consequent depolarization.
d. all of these.
e. none of these.
Chapter 48 Solutions
Study Guide for Campbell Biology
Ch. 48 - Prob. 1IQCh. 48 - a. What is the principal cation inside the cell?...Ch. 48 - The following diagram shows the changes in...Ch. 48 - Prob. 4IQCh. 48 - Prob. 5IQCh. 48 - Prob. 6IQCh. 48 - Prob. 7IQCh. 48 - Develop a flowchart or diagram or write a...Ch. 48 - Prob. 1TYKCh. 48 - Prob. 2TYK
Ch. 48 - During a neurons resting state a. there are more...Ch. 48 - Which of the following contribute(s) to the...Ch. 48 - Prob. 5TYKCh. 48 - Prob. 6TYKCh. 48 - Prob. 7TYKCh. 48 - After the rapid depolarization of an action...Ch. 48 - Nodes of Ranvier are a. gaps where Schwann cells...Ch. 48 - Prob. 10TYKCh. 48 - Signal transmission is faster in myelinated axons...Ch. 48 - Which of the following statements concerning...Ch. 48 - Prob. 13TYKCh. 48 - Prob. 14TYKCh. 48 - Prob. 15TYKCh. 48 - Prob. 16TYKCh. 48 - Prob. 17TYKCh. 48 - If the binding of a neurotransmitter to its...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The resting membrane potential results fromA. uneven distribution of ions across the cell membrane only.B. differences in membrane permeability to Na+ and K+ onlyC. activity of the sodium/potassium pump only.D. uneven distribution of ions across the cell membrane, differences in membrane permeability to Na+ and K+, and sodium/potassium pump activityarrow_forwardWhich of the following statements about hyperpolarization is true? a. it is not an increase in membrane potential b. causes the voltage of the internal membrane towards zero c. inside the membrane becomes more positive than resting potential d. lowers the probability of producing an action potential e. none of the abovearrow_forwardWhich of the following statements relating to depolarization is incorrect? a. it is a reduction in membrane potential b. inside the membrane becomes less negative than resting potential c. enhances the probability of producing an action potential d. causes the voltage of internal membrane towards zero e. none of the abovearrow_forward
- A. the fact that one represents a depolarization and the other represents a hyperpolarization. B. the capacitive properties of the membrane. C. the difference in applied voltage.arrow_forwardThreshold potential is O a. typically 10 mV to 20 mV depolarized from ("higher than") resting potential. b. the membrane potential at which a graded potential is converted to an action potential. c. both of these. d. neither of these.arrow_forwardWhich of the following statements is FALSE? a. graded potentials can sum over time and space, action potential cannot b. action potentials have refractory periods, graded potentials do not c. action potentials are all-or-none, graded potentials are not d. graded potentials and action potentials are caused by ions moving through open channels e. all of the above statements are true (if all of the above are true this is the correct answer) ....arrow_forward
- Which of the following statements about membrane ion channels is incorrect? a. mechanically gated channels respond to physical deformation b. ligand-gated channels respond to neurotransmitters c. voltage-gated channels respond to changes in membrane potential d. leakage channels have gates and are always open e. none of the abovearrow_forwardWhich of the following is TRUE regarding the absolute and relative refractory periods of the action potential (AP)? A. The absolute refractory period may be overcome if enough excitatory stimulation is applied to the neuronal membrane. B. The absolute refractory period is due the closing of the activation gate of voltage gated sodium channels at the peak of the AP. C. The relative refractory period is due to the closing of the activation gate of voltage gated potassium channels during the overshoot phase of the AP. D. The relative refractory period is due the closing of the inactivation gate of voltage gated sodium channels . E. All of the above statements are FALSE.arrow_forwardPost synaptic neurons membrane potentials are less negative than resting membrane potentials when this occur A. Creates a new set point for the resting membrane potential B. Has a lower propensity to produce an action potential C. Reacts by generating action potential D. Higher chance of reaching the potential thresholdarrow_forward
- During the depolarization phase of an action potential, the permeability of the plasma membrane toa. Ca2+increases. c. K+ increases. e. Na+ decreases.b. Na+ increases. d. Ca2+decreases.arrow_forwardWhich of the following situations correctly illustrates the all-or-none principle? Select one: o a. A smaller voltage change will result in a smaller nerve impulse. o b. A stronger impulse can be generated by increasing the number of open voltage-gated sodium channels during depolarization. O C. A greater voltage change and a smaller voltage change will result in the same action potential as long as the threshold potential has been reached. o d. A faster impulse can be generated with a voltage change that is greater than the threshold potential.arrow_forwardWhich 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.arrow_forward
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