ANATOMY & PHYSIOLOGY LL W/CONNECT ACCESS
ANATOMY & PHYSIOLOGY LL W/CONNECT ACCESS
4th Edition
ISBN: 9781265521363
Author: McKinley
Publisher: MCG
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Chapter 12, Problem 7DYKB

_____ 7. An action potential is generated when threshold is reached, at which time

  1. a. voltage-gated K+ channels close.
  2. b. voltage-gated Na+ channels open.
  3. c. chemically gated Na+ channels open.
  4. d. Ca2+ enters the cell.
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Depolarization and repolarization changes that occur during the action potential are produced by   a. Negative feedback loops b. Channel mediated transport c. Simple diffusion of ions down their concentration gradient d. Active transport pumps along the neuron membrane
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.
The input region lacks _________________, but contains _____________________,  Group of answer choices A. Ligand-gated channels, voltage gated channels B. K+ leak channels, voltage gated channels C. Voltage-gated channels, ligand gated channels D. Ligand-gated channels, K+ leak channels

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