Campbell Biology in Focus
Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 37, Problem 2TYU
Summary Introduction

Introduction:

In neuronal signaling, the ions have an important role. Like rest of the cells, the ions are also unequally distributed in the neurons. If there is shifting of the membrane potential sufficiently, due to depolarization, then that results in massive change in the voltage (membrane), which is known as the action potential.

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Which of the following statements is FALSE? a. graded potentials can sum over time and space, action potential cannot b. action potentials have refractory periods, graded potentials do not c. action potentials are all-or-none, graded potentials are not d. graded potentials and action potentials are caused by ions moving through open channels e. all of the above statements are true (if all of the above are true this is the correct answer) ....
Which of the following is true about the conduction of action potentials?  a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.
Any change in a neuron's membrane potential that moves the membrane potential to a value more negative than the resting potential (e.g. -120mv) is:  a. Hypopolarization  b. Depolarization  c. An action potential  d. HyperpolarizationNOTE: A IS INCORRECT
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