Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433769
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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WHAT IF? Suppose a mutation caused gated sodiumchannels to remain inactivated longer after an actionpotential. How would this affect the frequency at whichaction potentials could be generated? Explain.
WHAT IF? Ouabain, a plant substance used in some cultures topoison hunting arrows, disables the sodium-potassium pump.What change in the resting potential would you expect to seeif you treated a neuron with ouabain? Explain.
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If the Cl- concentration outside of cells is 10 mM and inside of cells is 10mM, what would the Cl- equilibrium potential be? When the membrane is at +10mV. The chloride flows in which direction?
Chapter 37 Solutions
Campbell Biology in Focus, Books a la Carte Edition; 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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- Fil in the blanks 1. A resting muscle fiber or neuron has an internal charge that is A. positive, B. negative, or C. neutral compared to the extracellular environment. This resting membrane charge is maintained by the A. calcium ion channels, B. sodium voltage gates, C. potassium voltage gates, or D. sodium/potassium pumps? . When a muscle fiber is at resting membrane potential there is a(an) "higher", "equal", OR "lower" concentration of sodium inside the cell compared to outside the cell and a(an) "higher", "lower", OR "equal" concentration of potassium inside the cell compared to outside.arrow_forwardWHAT IF? If all the Ca2+in the fluidsurrounding a neuron were removed,how would this affect the transmission ofinformation within and between neurons?arrow_forwardPlease ASAP. Thank you What is the effect of membrane potentials on the movement of ions across a cell? Calculate this below.arrow_forward
- Please ASAP. Thanks Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 What is the effect of the addition of extracellular TTX and TEA on equilibrium potential? TTX blocks K channel, and TEA blocks Na Channels. No change in the equilibrium potentail. TTX blocks Na channel and TEA blocks K Channels. The equilibrium potentials become less positive TTX blocks Na channel and TEA blocks K Channels. The equilibrium potential becomes more positive for both TTX blocks Na channel and TEA blocks K Channels. No change in the equilibrium potentail. TTX and TEA blocks Na channel. No change in the equilibrium potentail.arrow_forward37.Given an intracellular concentration of 120mM and an extracellular concentration of 15mM, calculate the Nernst Equilibrium Potential for K+ in mV 38 Given an intracellular concentration of 2mM and an extracellular concentration of 107mM, calculate the Nernst Equilibrium Potential for Cl- in mV 39 A cell has an actual membrane potential (Em) at rest of -75mV. The equilibrium potential for Na+ is +120mV and the equilibrium potential for K+ is -95mV. Calculate the net driving force for Na+ in mV.arrow_forwardPlease ASAP. Thank you Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 If the resting membrane potential is -65, give the direction of the flow of Na+, Ca++, K+, and Cl- ion? Na and Cl flows inside, K and Ca flows outside K and Ca flows inside, Na and Cl flows outside Na and K flows inside, Ca and Cl flows outside Na and Ca flows inside, K and Cl flows outsidearrow_forward
- Please asap. thanku Qs 3 If the K+ channels are blocked by TEA, which direction does the equilibrium potential for K+ move? And why?arrow_forwardWHAT IF? What would happen if a mutationin protein kinase 2 made it incapable of beingphosphorylated?arrow_forwardWHAT IF? Some membrane proteins diffuse faster in the plasma membrane when the cytoskeleton or the extracellular matrix is artificially removed than when cells are unperturbed. Explain why.arrow_forward
- H8. describe the steps of a Local Potential, what channels open? what happens to the membrane potential?arrow_forwardPlease ASAP. Thank you If the resting membrane potential is -65, give the direction of the flow of Na+, Ca++, K+, and Cl- ion? Na and Cl flows inside, K and Ca flows outside K and Ca flows inside, Na and Cl flows outside Na and K flows inside, Ca and Cl flows outside Na and Ca flows inside, K and Cl flows outsidearrow_forwardWHAT IF? If two cells have different scaffolding proteins,explain how they might behave differently in response tothe same signaling molecule.arrow_forward
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