Campbell Biology (11th Edition)
Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 48, Problem 1TYU

Level 1: Knowledge/Comprehension

1. What happens when a resting neuron’s membrane depolarizes?

(A) There is a net diffusion of Na+ out of the cell.

(B) The equilibrium potential for K+ (EK) becomes more positive.

(C) The neuron’s membrane voltage becomes more positive.

(D) The cell’s inside is more negative than the outside.

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What happens when a resting neuron’s membranedepolarizes?(A) There is a net diffusion of Na+out of the cell.(B) The equilibrium potential for K+(EK) becomesmore positive.(C) The neuron’s membrane voltage becomesmore positive.(D) The cell’s inside is more negative than the outside
1) Draw a pseudo-unipolar neuron synapsing onto a dendrite on a multi-polar neuron. Label the cell body on both neurons and the synaptic cleft. 2) Draw a typical neuron and the relative ion concentrations (high or low) for Na+ and K+ inside and outside the cell. 3) If a cation channel suddenly opened at rest which direction would K+ move and why? Which way would Na+ ions move? 2
Depolarization of a neuron plasma membrane will shift the membrane potential toward (a) 0 mV. (b) -70 mV. (c) -90 mV. (d) a, b, and c are correct.

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Campbell Biology (11th Edition)

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