Campbell Essential Biology with Physiology (6th Edition)
6th Edition
ISBN: 9780134711751
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 27, Problem 4SQ
Summary Introduction
Introduction:
Action potential is an electrical stimulus that propagates along the plasma membrane of a neuron. Neuron responds to this electrical stimulus and converts it into an action potential. To generate action potential, a strong stimulus that is any change in the environment is required.
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Action potentials ____.
Select one:
A.can occur only once
B.can move up or down an axon, away from or towards the cell body
C.move in a one way direction towards the cell body
D.move in a one way direction away from the cell body
During an Action Potential…..
_____ Na+ flows out of the cell
_____ Na+ activation gates and inactivation gates are both open
_____ Na+ flows into the cell
_____ Calcium flows out of the cell
_____ K + gates are open
_____ Na+ activation gates are closed
_____ Na+ inactivation gates are closed
_____ K+ flows into the cell
_____ K + gates are closed
_____ Na+ activation gates and inactivation gates are both closed
_____ K + flows out of the cell
An action potential begins when______ . a. a neuron reaches threshold potential b. voltage-gated potassium gates open c. voltage-gated sodium gates close d. sodium–potassium pumps stop operating
Chapter 27 Solutions
Campbell Essential Biology with Physiology (6th Edition)
Ch. 27 - A neuron ends in many branches, each with a...Ch. 27 - Prob. 2SQCh. 27 - Your nervous system can be divided into two broad...Ch. 27 - Prob. 4SQCh. 27 - Prob. 5SQCh. 27 - Prob. 6SQCh. 27 - How is an action potential different from a...Ch. 27 - For each of the following senses in humans,...Ch. 27 - Mr. Johnson is becoming slightly deaf. To test his...Ch. 27 - Prob. 10SQ
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- When action potentials arrive at a synapse between a neuron and another cell, they stimulate the release of molecules of a ________ that diffuse over to that cell.arrow_forwardWhich of the following would most likely suppress an action potential in neurons? Select one: a. increased amount of ATP b. movement of chlorine down its concentration gradient c. active transport of chlorine d. opening of sodium channels e. closing calcium channels Clear my choicearrow_forwardMyelinated and unmyelinated neurons requires _________ to propagate action potential down the axon. Select one: a. both passive conduction and active propagation b. either one of passive conduction and active propagation c. passive propagation only d. active propagation onlyarrow_forward
- 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 INCORRECTarrow_forwardDepolarization 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 membranearrow_forwardThe made-up drug leakyhose degrades myelin resulting in myelin becoming more porous and therefore a poor insulator. 2.) Which of the following would NOT be an effect of leakyhose? A. Propagation of the action potential would likely slow B. The action potential may degrade because it can’t properly be regenerated C. The action potential would not propagate but would rather reverse directions D. Saltatory conduction may be disrupted E. All of the above effects are consistent with the administration of leakyhosearrow_forward
- During an action potential, the inside of the cell membrane becomes more positive than the outside. Why does this happen? a. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the inside more positive. b. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the outside more positive. c. During depolarization, the potassium ions rush in and the sodium ions have begun rushing out, making the inside more positive. d. During depolarization, the sodium ions rush in and the potassium ions have begun rushing out, making the outside more positive.arrow_forwardWhen a neuron is at rest,_____ . a. it is at threshold potential b. voltage-gated sodium channels are open c. sodium–potassium pumps are operating d. it contains more sodium ions than the surrounding interstitial fluidarrow_forwardWhen a neuron is at rest, the inside of the cell A has a slight negative charge relative to the outside B has no charge C has a slight positive charge relative to the outside D has a charge identical to the outsidearrow_forward
- True or False a. When they are at rest, neurons are more positively charged inside than outside the cell. b. Action potentials originate at the axon terminal and move towards the dendrites. c. Afferent pathways send sensory information to the CNS for processing. d. An action potential is something that only occurs at synapses. Choose ONE FALSE statement from the previous set and explain why it is incorrect.arrow_forwardWhich of the following statements does NOT correctly describe the repolarization of a neuron? a. The potassium channels are slower to open, allowing the potassium ions to leave after depolarization. b. The potassium ions leave the cell, thereby returning the neuron to its resting potential. c. The neuron becomes more polarized and more negatively charged than its original resting membrane potential. d. The sodium and potassium channels open, allowing the positive ions to move out of the cell.arrow_forwardWhich 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) ....arrow_forward
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