EBK ANATOMY & PHYSIOLOGY: THE UNITY OF
7th Edition
ISBN: 8220102796409
Author: SALADIN
Publisher: YUZU
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Chapter 12, Problem 4TF
Summary Introduction
Introduction:
An action potential is a more considerable change formed by voltage-gated ion channels in the membrane. Any change in the resting membrane potential of a nerve cell produced by a stimulus, opening ligand regulated Na+ gate in the plasma membrane of the neuron.
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Chapter 12 Solutions
EBK ANATOMY & PHYSIOLOGY: THE UNITY OF
Ch. 12.1 - Prob. 1BYGOCh. 12.1 - Prob. 2BYGOCh. 12.1 - Prob. 3BYGOCh. 12.1 - Prob. 1AYLOCh. 12.1 - Prob. 2AYLOCh. 12.1 - Prob. 3AYLOCh. 12.1 - Prob. 4AYLOCh. 12.2 - Prob. 4BYGOCh. 12.2 - Prob. 5BYGOCh. 12.2 - Prob. 6BYGO
Ch. 12.2 - Prob. 7BYGOCh. 12.2 - Prob. 1AYLOCh. 12.2 - Prob. 2AYLOCh. 12.2 - Prob. 3AYLOCh. 12.2 - Prob. 4AYLOCh. 12.2 - Prob. 5AYLOCh. 12.3 - Prob. 8BYGOCh. 12.3 - Prob. 9BYGOCh. 12.3 - Prob. 10BYGOCh. 12.3 - Prob. 1AYLOCh. 12.3 - Prob. 2AYLOCh. 12.3 - Prob. 3AYLOCh. 12.3 - Prob. 4AYLOCh. 12.4 - Prob. 11BYGOCh. 12.4 - Prob. 12BYGOCh. 12.4 - Prob. 13BYGOCh. 12.4 - Prob. 14BYGOCh. 12.4 - Prob. 15BYGOCh. 12.4 - Prob. 16BYGOCh. 12.4 - Prob. 17BYGOCh. 12.4 - Prob. 1AYLOCh. 12.4 - Prob. 2AYLOCh. 12.4 - Prob. 3AYLOCh. 12.4 - Prob. 4AYLOCh. 12.4 - Prob. 5AYLOCh. 12.4 - Prob. 6AYLOCh. 12.4 - Prob. 7AYLOCh. 12.4 - Prob. 8AYLOCh. 12.4 - Prob. 9AYLOCh. 12.5 - Prob. 18BYGOCh. 12.5 - Prob. 19BYGOCh. 12.5 - Prob. 20BYGOCh. 12.5 - Prob. 21BYGOCh. 12.5 - Prob. 1AYLOCh. 12.5 - Prob. 2AYLOCh. 12.5 - Prob. 3AYLOCh. 12.5 - Prob. 4AYLOCh. 12.5 - Prob. 5AYLOCh. 12.5 - Prob. 6AYLOCh. 12.5 - Prob. 7AYLOCh. 12.5 - Prob. 8AYLOCh. 12.5 - Prob. 9AYLOCh. 12.6 - Prob. 22BYGOCh. 12.6 - Prob. 23BYGOCh. 12.6 - Prob. 24BYGOCh. 12.6 - Prob. 25BYGOCh. 12.6 - Prob. 1AYLOCh. 12.6 - Prob. 2AYLOCh. 12.6 - Prob. 3AYLOCh. 12.6 - Prob. 4AYLOCh. 12.6 - Prob. 5AYLOCh. 12.6 - Prob. 6AYLOCh. 12.6 - Prob. 7AYLOCh. 12.6 - Prob. 8AYLOCh. 12.6 - Prob. 9AYLOCh. 12.6 - Prob. 10AYLOCh. 12.6 - Prob. 11AYLOCh. 12.6 - Prob. 12AYLOCh. 12.6 - Prob. 13AYLOCh. 12.6 - Prob. 14AYLOCh. 12 - The integrative functions of the nervous system...Ch. 12 - The highest density of voltage-gated ion channels...Ch. 12 - The soma of a mature neuron lacks a. a nucleus. b....Ch. 12 - The glial cells that fight infections in the CNS...Ch. 12 - Posttetanic potentiation of a synapse increases...Ch. 12 - An IPSP is_____of the postsynaptic neuron. a. a...Ch. 12 - Prob. 7TYRCh. 12 - Prob. 8TYRCh. 12 - Prob. 9TYRCh. 12 - Prob. 10TYRCh. 12 - Prob. 11TYRCh. 12 - Prob. 12TYRCh. 12 - Prob. 13TYRCh. 12 - Prob. 14TYRCh. 12 - Prob. 15TYRCh. 12 - A myelinated nerve fiber can produce action...Ch. 12 - Prob. 17TYRCh. 12 - Prob. 18TYRCh. 12 - Prob. 19TYRCh. 12 - Prob. 20TYRCh. 12 - Prob. 1BYMVCh. 12 - Prob. 2BYMVCh. 12 - Prob. 3BYMVCh. 12 - Prob. 4BYMVCh. 12 - Prob. 5BYMVCh. 12 - Prob. 6BYMVCh. 12 - Prob. 7BYMVCh. 12 - Prob. 8BYMVCh. 12 - Prob. 9BYMVCh. 12 - Prob. 10BYMVCh. 12 - Prob. 1TFCh. 12 - Prob. 2TFCh. 12 - Prob. 3TFCh. 12 - Prob. 4TFCh. 12 - Excitatory postsynaptic potentials lower the...Ch. 12 - Prob. 6TFCh. 12 - Prob. 7TFCh. 12 - Myelinated nerve fibers conduct signals more...Ch. 12 - Prob. 9TFCh. 12 - Prob. 10TFCh. 12 - Schizophrenia is sometimes treated with drugs such...Ch. 12 - Hyperkalemia is an excess of potassium ill the...Ch. 12 - Suppose a poison were to slow down the Na+-K+...Ch. 12 - Prob. 4TYCCh. 12 - Prob. 5TYC
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- The accelerating flow of _______ ions through gated channels across the membrane triggers an action potential. a. potassium b. sodium c. hydrogen d. a and barrow_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_forwardUsing the Goldman-Hodgkin-Katz equation, determine what happens to the resting membrane potential if the ECF K+ concentration doubles to 10 mM.arrow_forward
- One of the important uses of the Nernst equation is in describing the flow of ions across plasma membranes. Ions move under the influence of two forces: the concentration gradient (given in electrical units by the Nernst equation) and the electrical gradient (given by the membrane voltage). This is summarized by Ohms law: Ix=Gx(VmEx) which describes the movement of ion x across the membrane. I is the current in amperes (A); G is the conductance, a measure of the permeability of x, in Siemens (S), which is I/V;Vm is the membrane voltage; and Ex is the equilibrium potential of ion x. Not only does this equation tell how large the current is, but it also tells what direction the current is flowing. By convention, a negative value of the current represents either a positive ion entering the cell or a negative ion leaving the cell. The opposite is true of a positive value of the current. a. Using the following information, calculate the magnitude of Na [ Na+ ]0=145mM,[ Na+ ]i=15mM,Gna+=1nS,Vm=70mV b. Is Na+ entering or leaving the cell? c. Is Na+ moving with or against the concentration gradient? Is it moving with or against the electrical gradient?arrow_forwardDescribe the mechanism through which a potassium channel can selectively move K* ions across a membrane while preventing the movement of smaller Na* ions.arrow_forwardWhat happens to the membrane potential inside and outside of the cell when Na+ channels are open?arrow_forward
- At the peak of an action potential, would the relative permeability of Na be higher than K? Which ion would be the least permeable to the membrane during falling phase?arrow_forwardDescribe how the magnitude and polarity of the sodium and potassium membrane currents vary with the amplitude of membrane depolarizationarrow_forwardList the Forces influencing sodium and potassium ions at the resting membrane potential?arrow_forward
- What type of transport mechanism is demonstrated by Na+ movement through the open voltage-gated Na+ channels?arrow_forwardHyperkalemia 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?arrow_forwardThe resting membrane potential is a negative value because of:arrow_forward
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