CAMPBELL BIO ETXT+ACCESS >IC<
11th Edition
ISBN: 9781323770689
Author: Reece
Publisher: PEARSON C
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Textbook Question
Chapter 48, Problem 48.2CR
Suppose you placed an isolated neuron in a solution Similar to extracellular fluid and later transferred the neuron to a solution lacking any sodium ions. What change would you expect m the resting potential?
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Suppose you placed an isolated neuron in a solution similar toextracellular fluid and later transferred the neuron to a solution lackingany sodium ions. What change would you expect in the resting potential?
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Chapter 48 Solutions
CAMPBELL BIO ETXT+ACCESS >IC<
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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- Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)arrow_forwardAssume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.arrow_forwardWhen 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_forward
- Define an action potential.arrow_forwardFigure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?arrow_forwardIf the postsynaptic cell's plasma membrane were to become substantially more permeable to Na+, you would expect the membrane potential to [depolarize, hyperpolarize] __________________. You would expect the membrane potential to depolarize if the extracellular K+ concentration were to [increase, decrease] ______________. a.) hyperpolarize, decrease b.) depolarize, decrease c.) depolarize, decrease d.) hyperpolarize, increasearrow_forward
- In an experiment, the extracellular [Na+] surrounding a nerve cell was reduced from 145 to 45 mM. Which of the following is the most likely effect of this on action potentials? No action potentials would occur because the concentration of extracellular Na+ is too low. The membrane potential would become more negative so the threshold for action potential generation could not be reached. The nerve cell would still produce an action potential but its amplitude would be reduced and the depolarisation phase would be slower. The nerve cell would still produce an action potential but its amplitude would be reduced and the depolarization phase would be more rapid.arrow_forwardYou find a neuron whose resting potential is -90mV. Which of the following are likely to be true? (select all that apply) Voltage-gated sodium channels are closed The neuron is fully permeable to sodium The neuron is permeable to potassium The neuron is hyperpolarizedarrow_forwardThe extracellular sodium [Na+]0 is reduced in the saline bath. Following another current injection in a neuron, the membrane potential changes were recorded. a) Why has the membrane potential changed following the Na+ reduction? b) Why has the current injection produced no action potentials? c) How might you experimentally rescue action potential generation?arrow_forward
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