Campbell Biology in Focus; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433776
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Textbook Question
Chapter 37.2, Problem 2CC
WHAT IF? Suppose a cell’s membrane potential shifts from -70 mV to -50 mV. What changes in the cell’s permeability to K’ or Na could cause such a shift?
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Students have asked these similar questions
Calculate the equilibrium membrane potentials to be expected across a membrane at 37 °C, with a NaCl concentration of 0.10 M on the “right side” and 0.01 M on the “left side”, given the following conditions. In each case, state which side is (+) and which is (-).
(a) Membrane permeable only to Na+
(b) Membrane permeable only to Cl–
(c) Membrane equally permeable to both ions
Calculate the equilibrium membrane potentials to be expected across a membrane at 37 ∘C, with a NaCl concentration of 0.50M on the "right side" and 0.08 M on the "left side", given the following conditions. In each case, state which side is (+) and which is (−).
Membrane permeable only to Cl−.
Suppose that certain cells found in an organism are permeable to both CI" and Kt ions but no other ions at rest. The intra- and extracellular concentrations of both ions for these cells
are shown below. The resting membrane potential is -75 mV. Assume that passage of both ions across the membrane occurs through ion channels that are selective for each ion.
[Intracellular] [Extracellular]
CI
4 mM
110 mM
K+
25 mM
100 mM
Based on this information, what reasonable conclusion can you draw about the relative permeabilities of K* and CI" ions in these neurons at rest based on what we discussed?
а.
The membrane is more permeable to chloride ions than to potassium ions at rest.
b.
The membrane is more permeable to potassium ions than to chloride ions at rest.
С.
At rest, the membrane potential of these neurons lies closer to the potassium equilibrium potential (EK) than it does to the chloride equilibrium potential (ECI).
d.
Both a and c
е.
Both b and c
Chapter 37 Solutions
Campbell Biology in Focus; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd Edition)
Ch. 37.1 - Prob. 1CCCh. 37.1 - Describe the basic pathway of information flow...Ch. 37.1 - WHAT IF? How might increased branching of an axon...Ch. 37.2 - Under what circumstances could ions flow through...Ch. 37.2 - WHAT IF? Suppose a cells membrane potential shifts...Ch. 37.2 - Prob. 3CCCh. 37.3 - How do action potentials and graded potentials...Ch. 37.3 - In multiple sclerosis (from the Greek skleros,...Ch. 37.3 - Prob. 3CCCh. 37.3 - WHAT IF? Suppose a mutation caused gated sodium...
Ch. 37.4 - Prob. 1CCCh. 37.4 - Organophosphate pesticides work by inhibiting...Ch. 37.4 - MAKE CONNECTIONS Name one or more membrane...Ch. 37 - What happens when a resting neuron's membrane...Ch. 37 - Prob. 2TYUCh. 37 - Prob. 3TYUCh. 37 - Why are action potentials usually conducted in one...Ch. 37 - Which of the following is a direct result of...Ch. 37 - Suppose a particular neurotransmitter causes an...Ch. 37 - Prob. 7TYUCh. 37 - Prob. 8TYUCh. 37 - DRAW IT Suppose a researcher inserts a pair of...Ch. 37 - Prob. 10TYUCh. 37 - FOCUS ON EVOLUTION An action potential is an...Ch. 37 - Prob. 12TYUCh. 37 - SYNTHESIZE YOUR KNOWLEDGE The rattlesnake alerts...
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- Calculate the maximum ratio that can be achieved by the plasma membrane Na+-glucose symporter of an epithelial cell when [Na+]in is 12 mM, [Na+]out is 145 mM, the membrane potential is −50 mV (inside negative), and the temperature is 37 °C.arrow_forwardConsidering this graph of membrane potential, what is most likely occurring during the period indicated by the green box?arrow_forwardIf sodium permeability were to increase compared to normal what would be the resulting effect on the membrane potential 1.The charge on the inside of the cell becomes less negative compared to resting conditions and hyperpolarizes 2.The charge on the inside of the cell becomes more negative compared to resting conditions and hyperpolarizes 3.The charge on the inside of the cell becomes less negative compared to resting conditions and depolarizes 4.The charge on the inside of the cell becomes more negative compared to resting conditions and depolarizesarrow_forward
- ab ock fn H QUESTION 11 What property of the voltage-gated potassium channels allows K ions to pass? O a. Two polypeptide subunits are synthesized when the membrane is depolarized, allowing K+ ions to pass. O b. Depolarization causes the subunits to temporarily disintegrate so that K* ions can pass through the membrane Oc. The voltage-gated potassium channels open when the polypeptide subunits are disinhibited O d. Depolarization causes the four polypeptide subunits specific to the voltage-gated K* channel to twist into a shape that allows K* ions to pass esc K← →→ QUESTION 12 Why does ACh slow the heart rate? O a. It stimulates muscarinic receptors that open potassium channels O b. It stimulates muscarinic receptors that close potassium channels O c. It stimulates nicotinic receptors that open potassium channels Od. It stimulates nicotinic receptors that close potassium channels per the core o Click Save and Submit to save and submit. Click Save All Answers to save all answers. ! Type…arrow_forwardThe rapid upstroke of a SA nodal cell action potential is due to the opening of voltage-gated Na+ channels. answer should clearly state whether or not the statement is correct and then concisely explain why. the answer should be 3-5 sentences and address all of the points in the statement. Here is an example: Both transmembrane carrier proteins and transmembrane channel proteins can mediate active transport of a hydrophilic solute through a cell plasma membrane. This statement is incorrect. Movement of a solute through a channel protein is always passive, whereas carrier-mediated transmembrane transport can be either passive or active. A transmembrane channel protein creates a pore through the membrane allowing for simple diffusion of a hydrophilic solute down a concentration gradient through the membrane. In contrast, transmembrane carrier protein interacts with and ‘escorts’ a hydrophilic solute through the membrane and is capable of transporting a solute against a concentration…arrow_forwardCalculate the change in Gibbs free energy for transport of Ca2+ from outside to inside the cell. The extracellular Ca2+ concentration is 135 uM, and the intracellular Ca2+ concentration is 98 uM. The membrane potential is -22 mV and the temperature is 37°C. O. -5.1 kJ/mol O 1.2 kJ/mol -410 kJ/mol 3.4 kJ/molarrow_forward
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