Principles of Human Physiology (6th Edition)

6th Edition

ISBN: 9780134169804

Author: Cindy L. Stanfield

Publisher: PEARSON

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Textbook Question

Chapter 7, Problem 15E

Which Of the following statements about graded potentials is false?

The magnitude of a graded potential varies with the strength of the stimulus.
Some graded potentials are hyperpolarizations; others are depolarizations.
Graded potentials are produced at ligand-gated ion channels.
Graded potentials can sum over space and time.
Graded potentials are limited in duration by the refractory period.

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Chapter 7, Problem 14E

Chapter 7, Problem 16E

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How do we distinguish a strong stimulus from a weak one when the information about both stimuli is relayed by action potentials that are all the same amplitude?

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Which of the following is NOT true regarding the changes that occur during an action potential. Check All That Apply When stimulus is sufficient to cause the threshold potential to be reached, the area stimulated opens its voltage-gated sodium channels.When stimulus is sufficient to cause the threshold potential to be reached, the area stimulated opens its voltage-gated sodium channels. After threshold is reached, the sodium ions move into the cell via the Na+/K+ pump, the inside of the cell becomes momentarily positive.After threshold is reached, the sodium ions move into the cell via the Na+/K+ pump, the inside of the cell becomes momentarily positive. At almost the same time as Na+ channels are closing, voltage-gated potassium channels open, allowing an increased movement of potassium ions out of the cellAt almost the same time as Na+ channels are closing, voltage-gated potassium channels open, allowing an increased movement of potassium ions out of the cell The…

Chapter 7 Solutions

Principles of Human Physiology (6th Edition)

Ch. 7.2 - Name the different parts, divisions, and...Ch. 7.2 - Prob. 7.1.2QC Ch. 7.2 - Prob. 7.1.3QC Ch. 7.3 - Prob. 7.2.1QC Ch. 7.3 - Prob. 7.2.2QC Ch. 7.3 - If channels that permitted both sodium ions and...Ch. 7.4 - Prob. 1CTQ Ch. 7.4 - Prob. 2CTQ Ch. 7.4 - Prob. 3CTQ Ch. 7.4 - Prob. 7.3.1QC

Ch. 7.4 - Prob. 7.3.2QC Ch. 7.4 - Prob. 7.3.3QC Ch. 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. 7.5.1QC Ch. 7.4 - Prob. 7.5.2QC Ch. 7.4 - Prob. 7.5.3QC Ch. 7.4 - Prob. 1aCTQ Ch. 7.4 - Prob. 2aCTQ Ch. 7.4 - Prob. 3aCTQ Ch. 7.5 - Prob. 7.6.1QC Ch. 7.5 - Prob. 7.6.2QC Ch. 7.5 - Prob. 7.6.3QC Ch. 7 - Prob. 1E Ch. 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. 6E Ch. 7 - If the membrane potential of a neuron becomes more...Ch. 7 - Prob. 8E Ch. 7 - Prob. 9E Ch. 7 - Prob. 10E Ch. 7 - Prob. 11E Ch. 7 - Prob. 12E Ch. 7 - Prob. 13E Ch. 7 - Prob. 14E Ch. 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. 20E Ch. 7 - Prob. 21E Ch. 7 - Prob. 22E Ch. 7 - Prob. 23E Ch. 7 - Prob. 24E Ch. 7 - The electrochemical force for potassium ions when...Ch. 7 - Both sodium and potassium channels have...Ch. 7 - Prob. 27E Ch. 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. 31E Ch. 7 - Prob. 32E Ch. 7 - Prob. 33E Ch. 7 - Prob. 34E Ch. 7 - Prob. 35E Ch. 7 - Muscle cells, like neurons, are excitable cells...Ch. 7 - Prob. 37E Ch. 7 - Prob. 38E Ch. 7 - Predict what would happen to the resting...

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