EBK PRINCIPLES OF HUMAN PHYSIOLOGY
6th Edition
ISBN: 9780134399485
Author: STANFIELD
Publisher: PEARSON CO
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Textbook Question
Chapter 7, Problem 7E
If the membrane potential of a neuron becomes more negative than it was at rest, then the neuron is________ in this state, the neuron is_____excitable.
- depolarized; more
- hyperpolarized; more
- depolarized; less
- hyperpolarized; less
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Which statement(s) regarding ions is true when a neuron is at rest?
Positively charged cations are attracted to the intracellular fluid
Positively charged anions are attracted to the intracellular fluid
Negatively charged anions are drawn to the intracellular fluid
Negatively charged anions are balanced across the cell membrane
An influx of positive sodium ions eventually causes closing of the inactivation gates of voltage regulated sodium channels, stopping the influx of positive sodium ions, and thus the final stages of an action potential are regulated by _____ feedback.
An influx of positive sodium ions causes opening of the activation gates of voltage regulated sodium channels resulting in a further influx of positive sodium ions, and thus the initial stages of an action potential are regulated by ______ feedback.
Chapter 7 Solutions
EBK PRINCIPLES OF HUMAN PHYSIOLOGY
Ch. 7.2 -
Name the different parts, divisions, and...Ch. 7.2 - Prob. 7.1.2QCCh. 7.2 - Prob. 7.1.3QCCh. 7.3 - Prob. 7.2.1QCCh. 7.3 - Prob. 7.2.2QCCh. 7.3 - If channels that permitted both sodium ions and...Ch. 7.4 - Prob. 1CTQCh. 7.4 - Prob. 2CTQCh. 7.4 - Prob. 3CTQCh. 7.4 - Prob. 7.3.1QC
Ch. 7.4 - Prob. 7.3.2QCCh. 7.4 - Prob. 7.3.3QCCh. 7.4 - During the depolarization of an action potential,...Ch. 7.4 - Compare the gating mechanisms of the voltage-gated...Ch. 7.4 - During which phase of an action potential are the...Ch. 7.4 - Prob. 7.5.1QCCh. 7.4 - Prob. 7.5.2QCCh. 7.4 - Prob. 7.5.3QCCh. 7.4 - Prob. 1aCTQCh. 7.4 - Prob. 2aCTQCh. 7.4 - Prob. 3aCTQCh. 7.5 - Prob. 7.6.1QCCh. 7.5 - Prob. 7.6.2QCCh. 7.5 - Prob. 7.6.3QCCh. 7 - Prob. 1ECh. 7 - Neurotransmitters are released most commonly from...Ch. 7 - If a cation is equally distributed across the cell...Ch. 7 -
The depolarization phase of an action potential...Ch. 7 - During the relative refractory period, a second...Ch. 7 - Prob. 6ECh. 7 - If the membrane potential of a neuron becomes more...Ch. 7 - Prob. 8ECh. 7 - Prob. 9ECh. 7 - Prob. 10ECh. 7 - Prob. 11ECh. 7 - Prob. 12ECh. 7 - Prob. 13ECh. 7 - Prob. 14ECh. 7 - Which Of the following statements about graded...Ch. 7 -
What are the subdivisions of the peripheral...Ch. 7 -
Information from the periphery is brought to the...Ch. 7 -
Which cell type is more abundant in the nervous...Ch. 7 - Voltage-gated calcium channels are located in...Ch. 7 - Prob. 20ECh. 7 - Prob. 21ECh. 7 - Prob. 22ECh. 7 - Prob. 23ECh. 7 - Prob. 24ECh. 7 - The electrochemical force for potassium ions when...Ch. 7 -
Both sodium and potassium channels have...Ch. 7 - Prob. 27ECh. 7 -
In myelinated axons, action potentials are...Ch. 7 -
The Na+ Ka+ pump causes the repolarization phase...Ch. 7 -
When a neuron is at the peak of an action...Ch. 7 - Prob. 31ECh. 7 - Prob. 32ECh. 7 - Prob. 33ECh. 7 - Prob. 34ECh. 7 - Prob. 35ECh. 7 -
Muscle cells, like neurons, are excitable cells...Ch. 7 - Prob. 37ECh. 7 - Prob. 38ECh. 7 -
Predict what would happen to the resting...
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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_forwardA(n)______neuron has one axon and one____ dendrite extending directly from the cell body. unipolar bipolar multipolar pseudounipolararrow_forwardStellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)arrow_forward
- Match each region of the central nervous system with some of its functions.arrow_forwardDuring the relative refractory period of a neuron, a second action potential is less likely, but not impossible, because: the amount of depolarization required to reach threshold has decreased the amount of depolarization required to reach threshold has increased the threshold value has decreased the threshold value has increasedarrow_forwardAfter an action potential, the opening of voltage-gated ________ channels and the inactivation of sodium channels, cause the membrane to return to its resting membrane potential. disodium potassium calcium chloride acetylcholinearrow_forward
- If a neuron is stimulated simultaneously by 2 stimuli at its dendrites (one generates a very large hyperpolarizing potential and the other generates a very small depolarizing potential). What would happen to this neuron? Group of answer choices The summation of these two graded potentials will generate an action potential and this action potential will travel down the axon. Summation of these two graded potentials will cause the membrane potential at the axon hillock to be more negative. These graded potentials will bring the resting membrane potential to 0 mV. These graded potentials with opposite polarity would therefore generate two action potentials and they will travel along this neuron in opposite direction.arrow_forwardIf the membrane potential at the axon hillock becomes subthreshold, an action potential will be fired. True or falsearrow_forwardTo maintain ________ action potentials are sent through ______ neurons.arrow_forward
- At __________ synapses, neurotransmitters hyperpolarize the membrane, by making it more permeable to K+ or moving membrane potential away from threshold (hyperpolarizing), and making generation of an action potential less likely; these are inhibitory postsynaptic potentials (EPSPs).arrow_forwardIn the resting state, before or long after an action potential occurs, the activation gates of voltage regulated sodium channels are _____, the inactivation gates of the voltage regulated sodium channels are _____, and the voltage regulated potassium channels are _____arrow_forwardWhen EPSP and IPSP occur simultaneously the postsynaptic membrane :-a- becomes depolarizedb- becomes hyperpolarizedc- initiates an action potentiald- shows potential changes that depend upon the summation of their effectsarrow_forward
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