Pearson eText Fundamentals of Anatomy & Physiology -- Instant Access (Pearson+)
11th Edition
ISBN: 9780136874089
Author: Frederic Martini, Judi Nath
Publisher: PEARSON+
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Chapter 12, Problem 6RQ
Depolarization of a neuron plasma membrane will shift the membrane potential toward (a) 0 mV, (b) −70 mV, (c) −90 mV, (d) all of these.
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Depolarization of a neuron plasma membrane will shift the membrane potential toward (a) 0 mV. (b) -70 mV. (c) -90 mV. (d) a, b, and c are correct.
Which of the following factors are important in the establishment of the membrane potential at -70 mV?
(i) Coulomb force;
(ii) Ion concentration;
(iii) Length of the axon;
(iv) Number of dendrites;
(v) Permeability of the cell membrane.
Select one:
a. (i), (iv), (v).
b. (ii), (iii).
c. (i), (ii), (v).
d. (iii), (iv).
The following is a graph of membrane potential over time during an action potential. At which labeled point, A-D, would permeability to potassium (K+) be the greatest?
A)
B)
C)
D)
Chapter 12 Solutions
Pearson eText Fundamentals of Anatomy & Physiology -- Instant Access (Pearson+)
Ch. 12 - Describe the three anatomical divisions of the...Ch. 12 - Describe the two functional divisions of the...Ch. 12 - Identify the two components of the efferent...Ch. 12 - Prob. 4CPCh. 12 - Name the structural components of a typical...Ch. 12 - Classify neurons according to their structure.Ch. 12 - Classify neurons according to their function.Ch. 12 - Prob. 8CPCh. 12 - Prob. 9CPCh. 12 - Prob. 10CP
Ch. 12 - Prob. 11CPCh. 12 - Prob. 12CPCh. 12 - Prob. 13CPCh. 12 - What effect would decreasing the concentration of...Ch. 12 - Define action potential.Ch. 12 - Identify the steps involved in the generation and...Ch. 12 - Prob. 17CPCh. 12 - Which of the following axons is myelinated: one...Ch. 12 - Prob. 19CPCh. 12 - Prob. 20CPCh. 12 - What effect would blocking voltage-gated calcium...Ch. 12 - Prob. 22CPCh. 12 - Prob. 23CPCh. 12 - Prob. 24CPCh. 12 - Prob. 25CPCh. 12 - Prob. 26CPCh. 12 - Prob. 27CPCh. 12 - LEVEL 1 Reviewing Facts and Terms 1. Label the...Ch. 12 - Prob. 2RQCh. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - The neural cells responsible for the analysis of...Ch. 12 - Depolarization of a neuron plasma membrane will...Ch. 12 - Prob. 7RQCh. 12 - Receptors that bind acetylcholine at the...Ch. 12 - What are the major components of (a) the central...Ch. 12 - Prob. 10RQCh. 12 - Prob. 11RQCh. 12 - If the resting membrane potential of a neuron is...Ch. 12 - Prob. 13RQCh. 12 - What is the difference between anterograde flow...Ch. 12 - What is the functional difference among chemically...Ch. 12 - State the all-or-none principle cf action...Ch. 12 - Prob. 17RQCh. 12 - Prob. 18RQCh. 12 - What are the structural and functional differences...Ch. 12 - Describe the events that occur during nerve...Ch. 12 - Prob. 21RQCh. 12 - Prob. 22RQCh. 12 - Prob. 23RQCh. 12 - In multiple sclerosis, there is intermittent and...Ch. 12 - Prob. 25RQCh. 12 - Which cells of the CNS are targeted by the polio...Ch. 12 - Prob. 2CC
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- Describe the contribution of each of the following to establishing and maintaining membrane potential: (a) the Na+K+ pump, (b) passive movement of K+ across the membrane, (c) passive movement of Na+ across the membrane, and (d) the large intracellular anions.arrow_forwardChoose the correct answer: A) When the voltage gated K+ channels open K+ moves down its concentration gradient from the ECF to inside the cell. O B) The value for resting membrane potential is closer to the EK+ (Equilibrium potential for K+) than the ENa+ O C) When the membrane potential is at rest the membrane is more permeable to Na+ than it is to K+ O D) Closing of the voltage-gated Na+ channels increases the permeability of the membrane to Na+arrow_forwardwhich of the following would be true (more than one can be true)? a) summation of A and X would reach threshold b) summation of C and A would be a graded potential c) stimulation by A would depolarize cell d) stimulation by B would be a subthreshold depolarization e) summation of B and C would be a graded potential with the net value of 12 mV depolarizationarrow_forward
- Match each type of membrane potential (resting, threshold, graded, or action) to its definition: a) The membrane potential at which voltage gated sodium channels open. b) The membrane potential that triggers the action potential. c) Change in membrane potential that may or may not reach threshold and that may be depolarizing or hyperpolarizing. d) Rapid, strong depolarization followed by immediate repolarization. This potential is self-renewing if the right ion channels are nearby.arrow_forwardWhat is the expected resting membrane potential (in mV) of a neuron that is typical in all ways except for possessing an intracellular potassium concentration of 94 mM and double the normal resting permeability to sodium?arrow_forwardNerve 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.arrow_forward
- Which is the state of voltage gated channel when the membrane potential has changed from resting (-40mV) to +20mV? a)Closed state b)Open state c)İnactivated statearrow_forwardThe 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.arrow_forwardThe sodium-potassium pump is really important to the functioning of neurons. (a) What does it do? (b) Why type of transport is it responsible for? Explain. (c) Imagine a person is exposed to a drug that destroys the sodium-potassium pump. How will this impact their neuron? Explain.arrow_forward
- Assume that in a neuron, the plasma membrane permeability values for potassium (K+), sodium (Na+), and Cl− are the following: PK = 1, PNa = 12, and PCl = 0.5. Based on physiological concentrations of K+, Na+, and Cl− (refer to the table), determine the membrane potential in this neuron.arrow_forwardWhat is the expected resting membrane potential (in mV) of a neuron that is typical in all ways except for possessing an extracellular potassium concentration of 104.3 mM, an intracellular sodium concentration of 103.6 mM, and 4 times the normal resting permeability to sodium?arrow_forwardAt the peak of the action potential, Vm is approximately -65 mV. Assuming normal intracellular and extracellular K+ concentrations (refer to the table), (1) calculate the driving force (in mV) that acts on K+ ions and (2) use the information obtained in part 1 to determine the direction in which K+ ions will flow (i.e., into the cell or out of cell)arrow_forward
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