PRINCIPLES OF HUMAN PHYSIOLOGY-PACKAGE
6th Edition
ISBN: 9780134587516
Author: STANFIELD
Publisher: PEARSON
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Chapter 7, Problem 25E
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After an action potential, the opening of voltage-gated ________ channels and the inactivation of sodium channels, cause the membrane to return to its resting membrane potential.
disodium
potassium
calcium
chloride
acetylcholine
Hyperkalemia is a condition by which ECF potassium levels become too high (usually due to kidney failure). Consider the following questions about the consequence of hyperkalemia on membrane potential.
How would hyperkalemia affect EK?
Considering your answer to the previous question, how would hyperkalemia affect membrane potential?
The membrane potential caused by differences in ions across the plasma membrane of an electrically excitable cell (when not stimulated) is called:
action potential
resting membrane potential
graded potential
local potential
Chapter 7 Solutions
PRINCIPLES OF HUMAN PHYSIOLOGY-PACKAGE
Ch. 7.2 -
Name the different parts, divisions, and...Ch. 7.2 - Prob. 7.1.2QCCh. 7.2 - Prob. 7.1.3QCCh. 7.3 - Prob. 7.2.1QCCh. 7.3 - Prob. 7.2.2QCCh. 7.3 - If channels that permitted both sodium ions and...Ch. 7.4 - Prob. 1CTQCh. 7.4 - Prob. 2CTQCh. 7.4 - Prob. 3CTQCh. 7.4 - Prob. 7.3.1QC
Ch. 7.4 - Prob. 7.3.2QCCh. 7.4 - Prob. 7.3.3QCCh. 7.4 - During the depolarization of an action potential,...Ch. 7.4 - Compare the gating mechanisms of the voltage-gated...Ch. 7.4 - During which phase of an action potential are the...Ch. 7.4 - Prob. 7.5.1QCCh. 7.4 - Prob. 7.5.2QCCh. 7.4 - Prob. 7.5.3QCCh. 7.4 - Prob. 1aCTQCh. 7.4 - Prob. 2aCTQCh. 7.4 - Prob. 3aCTQCh. 7.5 - Prob. 7.6.1QCCh. 7.5 - Prob. 7.6.2QCCh. 7.5 - Prob. 7.6.3QCCh. 7 - Prob. 1ECh. 7 - Neurotransmitters are released most commonly from...Ch. 7 - If a cation is equally distributed across the cell...Ch. 7 -
The depolarization phase of an action potential...Ch. 7 - During the relative refractory period, a second...Ch. 7 - Prob. 6ECh. 7 - If the membrane potential of a neuron becomes more...Ch. 7 - Prob. 8ECh. 7 - Prob. 9ECh. 7 - Prob. 10ECh. 7 - Prob. 11ECh. 7 - Prob. 12ECh. 7 - Prob. 13ECh. 7 - Prob. 14ECh. 7 - Which Of the following statements about graded...Ch. 7 -
What are the subdivisions of the peripheral...Ch. 7 -
Information from the periphery is brought to the...Ch. 7 -
Which cell type is more abundant in the nervous...Ch. 7 - Voltage-gated calcium channels are located in...Ch. 7 - Prob. 20ECh. 7 - Prob. 21ECh. 7 - Prob. 22ECh. 7 - Prob. 23ECh. 7 - Prob. 24ECh. 7 - The electrochemical force for potassium ions when...Ch. 7 -
Both sodium and potassium channels have...Ch. 7 - Prob. 27ECh. 7 -
In myelinated axons, action potentials are...Ch. 7 -
The Na+ Ka+ pump causes the repolarization phase...Ch. 7 -
When a neuron is at the peak of an action...Ch. 7 - Prob. 31ECh. 7 - Prob. 32ECh. 7 - Prob. 33ECh. 7 - Prob. 34ECh. 7 - Prob. 35ECh. 7 -
Muscle cells, like neurons, are excitable cells...Ch. 7 - Prob. 37ECh. 7 - Prob. 38ECh. 7 -
Predict what would happen to the resting...
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- Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)arrow_forwardWhen action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.arrow_forwardDescribe 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_forward
- "The membrane potential arises from movements of charge that leave ion concentrations practically unaffected, causing only a very slight discrepancy in the number of positive and negative ions on the two sides of the membrane." is true or false.arrow_forwardIf: membrane potential=-70mV, ENa=+60mV, and Ex=-90mV, consider which directions Na+ and K+ will leak across the membrane. If both ions are crossing the membrane, what is the most important factor in determining whether membrane potential will become more positive or more negative?arrow_forwardIn a typical action potential, the membrane potential of the neuron or muscle changes from_____ millivolts to ____ millivolts.arrow_forward
- if you inject current into the middle of an axon by using an intracellular electrode you will get two action potentials traveling in opposite directions. Explain the biophysical basis for this effect including why you won't observe backpropogation.arrow_forwardWhich of these ions is actively transported through the cell membrane to re-establish a resting potential? K and Mg Na and K Mg and Cl Ca and Clarrow_forwardWhich of the following phases of an action potential is correctly matched with the changes in ion movement and membrane potential? All of these are correctly matched. Phase 1 – sodium movement into the cell Phase 3 – potassium movement into the cell Phase 2 – sodium movement out of the cellarrow_forward
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