Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 48.2, 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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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.
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.
MAKE CONNECTIONS Explain why the set of forces driving ionmovement across the plasma membrane of a cell is described as anelectrochemical (electrical and chemical) gradient (see Concept 7.4).
Chapter 48 Solutions
Campbell Biology (10th Edition)
Ch. 48.1 - Prob. 1CCCh. 48.1 - Describe the basic pathway of information flow...Ch. 48.1 - WHAT IF? How might increased branching of an axon...Ch. 48.2 - Under what circumstances could ions flow through...Ch. 48.2 - WHAT IF? Suppose a cell's membrane potential...Ch. 48.2 - MAKE CONNECTiONS Review Figure 7.10, which...Ch. 48.3 - How do action potentials and graded potentials...Ch. 48.3 - In multiple sclerosis (from the Greek skleros,...Ch. 48.3 - How do both negative and positive feedback...Ch. 48.3 - WHAT IF? Suppose a mutation caused gated sodium...
Ch. 48.4 - Prob. 1CCCh. 48.4 - Some pesticides inhibit acetylcholinesterase, the...Ch. 48.4 - Prob. 3CCCh. 48 - How would severing an axon affect the flow of...Ch. 48 - Suppose you placed an isolated neuron in a...Ch. 48 - Prob. 48.3CRCh. 48 - Prob. 48.4CRCh. 48 - Level 1: Knowledge/Comprehension 1. What happens...Ch. 48 - Level 1: Knowledge/Comprehension 1. What happens...Ch. 48 - Where are neurotransmitter receptors located? (A)...Ch. 48 - Why are action potentials usually conducted in one...Ch. 48 - Which of the following is the most direct result...Ch. 48 - Suppose a particular neurotransmitter causes an...Ch. 48 - WHAT IF? Ouabain, a plant substance used in some...Ch. 48 - Prob. 8TYUCh. 48 - DRAW IT Suppose a researcher inserts a pair of...Ch. 48 - EVOLUTION CONNECTION An action potential is an...Ch. 48 - Prob. 11TYUCh. 48 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 48 - Prob. 13TYU
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- WHAT IF? If two cells have different scaffolding proteins,explain how they might behave differently in response tothe same signaling molecule.arrow_forwardMAKE CONNECTIONS Is the flow of ions through a ligand-gated channelan example of active or passive transport? (Review Concepts 7.3 and 7.4.)arrow_forwardH8. describe the steps of a Local Potential, what channels open? what happens to the membrane potential?arrow_forward
- WHAT 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_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_forwardWHAT 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.arrow_forward
- Please ASAP. Thank you. 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?arrow_forwardPlease 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_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_forward
- Please ASAP. Thank you What is the effect of membrane potentials on the movement of ions across a cell? Calculate this below.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_forwardMAKE CONNECTIONSPDGF signals cells by binding toa cell-surface receptor tyrosinekinase. If you added a chemicalthat blocked phosphorylation,how would the results differ?(See Figure 11.8.)arrow_forward
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