Human Physiology: An Integrated Approach (7th Edition)
7th Edition
ISBN: 9780321981226
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 2CC
If a cell hyperpolarizes, does its membrane potential become more positive or more negative? Does the potential move closer to threshold or farther from threshold?
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The resting membrane potential is established by?
The Na+/K+-ATPase pumping Na+ into the cell and K+ out of the cell
The Na+/K+-ATPase pumping K+ into the cell and Na+ out of the cell
A larger diffusion of K+ out of the cell compared to diffusion of Na+ into the cell
A larger diffusion of K+ into the cell compared to diffusion of Na+ out of the cell
a) and d)
b) and c)
Finally, what will be the effect on the membrane potential if K+ loan move out of the cell?a) K+ will bring the membrane potential to 0 (neutral) b) The membrane potential won't be significantly affected (non-polarizing) c) K+ leaving will make the inside of the cell more negative (hyperpolarizing) d) K+ will make the inside of the cell more positive (depolarizing)
What is the difference between the membrane potential in a normal cell and an excitable cell?
Chapter 13 Solutions
Human Physiology: An Integrated Approach (7th Edition)
Ch. 13 - List the general steps of a reflex pathway,...Ch. 13 - If a cell hyperpolarizes, does its membrane...Ch. 13 - Prob. 3CCCh. 13 - Draw a reflex map of the flexion reflex initiated...Ch. 13 - Prob. 5CCCh. 13 - Prob. 6CCCh. 13 - Prob. 7CCCh. 13 - Prob. 1RQCh. 13 - Prob. 2RQCh. 13 - The pathway pattern that brings information from...
Ch. 13 - When the axon terminal of a modulatory neuron...Ch. 13 - Autonomic reflexes are also called _____ reflexes....Ch. 13 - Prob. 6RQCh. 13 - Prob. 7RQCh. 13 - Prob. 8RQCh. 13 - Prob. 9RQCh. 13 - Prob. 10RQCh. 13 - Prob. 11RQCh. 13 - Prob. 12RQCh. 13 - Prob. 13RQCh. 13 - Prob. 14RQCh. 13 - Prob. 15RQCh. 13 - Prob. 16RQCh. 13 - Prob. 17RQCh. 13 - At your last physical, your physician checked your...Ch. 13 - There are several theories about how presynaptic...Ch. 13 - Prob. 20RQCh. 13 - Prob. 21RQCh. 13 - Prob. 22RQ
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- 8) The diffusion of K+ out of the cell makes the inside of the cell less positive, or more negative, and acts to restore the original resting membrane potential. This process is called: a) depolarization b) hyperpolarization c) repolarizationarrow_forwardWhich of the following is ther eason why the potassium leaves the cell readily at the peak of the action potential?A) The sodium-potassium pumps work hard to return potassium to the extracellular fluid. B) Diffusion will continue to push potassium into the cell, but electrostatic pressure will move potassium out of the cell. C) Diffusion will push potassium out of the cell, but electrostatic pressure continues to attract potassium to the interior of the cell. D) Both diffusion and electrostatic pressure will cause potassium to exit the cell.arrow_forwardIn somewhat simple terms please explain the differences between electrical signal propagation through gap junctions and synapses. Which types of cells use each respective method, and how do these methods of transport differ?arrow_forward
- The sodium-potassium pump generates the following concentration gradients across the plasma membrane: high [Na"] and [K*] inside the cell and low [Na*] and [K] outside. high [Na ] and low [K] inside the cell and low [Na] and high [K] outside. low [Na] and [K*] inside the cell and high [Na*] and [K*] outside. low [Na"] and high [K*] inside the cell and high [Na] and low [K] outside.arrow_forwardWhat effect does an increase or a decrease in extracellularK+ concentration have on resting membrane potential?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_forward
- Are the membrane potential functions direct or indirect?arrow_forwardWhat is membrane potential and how is this created?arrow_forwardplease explain the differences between electrical signal propagation through gap junctions and synapses. Which types of cells use each respective method, and how do these methods of transport differ?arrow_forward
- What is the application of electrical application in Cell Membrane potential gradient?arrow_forwardWhat type of ion channel contributes to the restingmembrane potential? Describe the permeabilitycharacteristics of the plasma membrane.arrow_forwardThe membrane of most cells, including neurons, contains passive, open, K' leak channels. Given the normal K' concentrations and the resultant concentration gradient, which direction would K' be expected to move (diffuse) through these leak channels? Select one: 1/into the cell 2/out of the cellarrow_forward
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