CAMPBELL BIOLOGY CUSTOM W/MASTERING
5th Edition
ISBN: 9781323764534
Author: Reece
Publisher: PEARSON C
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Chapter 48, Problem 2TYU
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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The axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential?
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Chapter 48 Solutions
CAMPBELL BIOLOGY CUSTOM W/MASTERING
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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- Watch this video (http://openstaxcollege.org/l/summation) to learn about summation. The process of converting electrical signals to chemical signals and back requires subtle changes that can result in transient increases or decreases in membrane voltage. To cause a lasting change in the target cell, multiple signals are usually added together, or summated. Does spatial summation have to happen all at once, or can the separate signals arrive on the postsynaptic neuron at slightly different times? Explain your answer.arrow_forwardWhich is the correct order of the firing of a neuron? a. resting potential, threshold, action potential, refractory period b. resting potential, threshold, refractory period, action potential c. action potential, resting potential, refractory period, threshold d. threshold, resting potential, refractory period, action potentialarrow_forwardIf you inhibit the closing of sodium channels what do you predict the effect on neuronal function will be? If you inhibit the closing of sodium channels what do you predict the effect on neuronal function will be? Hyper-excitability: more sodium ions flow into the cell, causing neurons to fire more readily Hypo-excitability: more sodium ions flow into the cell, causing neurons not to fire as readily Less sodium is pumped out of the cell, slowing down return to the resting state Sodium ions are toxic to neurons, leading to cell proliferationarrow_forward
- In what way does the interior surface of the cell membrane of a resting (non-conducting) neuron differ from the external environment? The interior is: positively charged and contains less sodium. negatively charged and contains less sodium. negatively charged and contains less potassium positively charged and contains more sodium.arrow_forwardWe know the action potential threshold regulates whether a neuron fires an action potential or not. What sets this threshold? Is the action potential threshold the same for all neurons? Why or why not?arrow_forwardDefine each of the following and explain its importance to neuronal function: dendrites, soma, axon, and presynaptic terminal?arrow_forward
- What effect would you expect an antagonist that targets the voltage sensing domain of perisynaptic calcium channels of an inhibitory interneuron have on the firing frequency of a finically active neuron that interneuron synapses onto? Explain in detailsarrow_forwardDescribe the changes in the neuron membrane that occur throughout the course of an action potential. 2: Mention: Resting-state, threshold, depolarization, repolarization, and hyperpolarization. 3: mention how the action potential is related to neuron communication. (300 words)arrow_forward1. When a neuron is not generating an action potential, its membrane (the neurolemma) has a resting membrane potential. During rest, are gated Na+ and K+ channels (open? closed?)___________________________________.2. Only cells with “excitable membranes” can create action potentials. The two types of cells in the body that can do this are?___________________________________ and ___________________________________.3. Which event pushes a membrane further away from being able to generate another action potential: (hyperpolarization/depolarization /repolarization)?___________________________________.4. Short-lived, localized changes in polarity in the membrane of a neuron are called?___________________________________.5. During depolarization, which channels are open , Na+ or K+?___________________________________.arrow_forward
- After an action potential is fired, the neuron returns to its resting state with the help of... 1. The synapse 2. Neurotransmitters 3. Reuptake 4. the sodium potassium pumparrow_forwardExplain the propagation of an action potential. 1. Start with a stimulus 2. Follow through two points along the axon and include voltage-gated channels involved and their behavior. 3. Passive versus active flow as well as saltatory conductionarrow_forwardthe potassium leak channels were suddenly blocked in a resting neuron, what would happen to its resting membrane potential?arrow_forward
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