MasteringA&P with Pearson eText -- ValuePack Access Card -- for Anatomy & Physiology
6th Edition
ISBN: 9780134283388
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Textbook Question
Chapter 11.6, Problem 14CYU
Why does a myelinated axon conduct action potentials faster than a nonmyelinated axon?
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Why are impulses transmitted more quickly down a myelinated axon than down an unmyelinated axon?
Why does an action potential move in an all-or-nothing fashion down the length of an axon without stopping?
Unmyelinated axons conduct action potentials without decrement, but when myelinated axons lose myelin in demyelinating diseases such as multiple sclerosis, conduction of action potentials is blocked. Why?
Chapter 11 Solutions
MasteringA&P with Pearson eText -- ValuePack Access Card -- for Anatomy & Physiology
Ch. 11.1 - What is meant by integration, and does it...Ch. 11.1 - Which subdivision of the PNS is involved in (a)...Ch. 11.2 - Which type of neuroglia controls the extracellular...Ch. 11.2 - Which two types of neuroglia form insulating...Ch. 11.3 - How does a nucleus within the brain differ from a...Ch. 11.3 - How is a myelin sheath formed in the CNS, and what...Ch. 11.3 - Which structural and functional type of neuron is...Ch. 11.3 - MAKING CONNECTIONS Which part of the neuron is its...Ch. 11.4 - For an open channel, what factors determine in...Ch. 11.4 - Prob. 10CYU
Ch. 11.5 - What determines the size of a graded potential?Ch. 11.6 - Which is bigger, a graded potential or an action...Ch. 11.6 - An action potential does not get smaller as it...Ch. 11.6 - Why does a myelinated axon conduct action...Ch. 11.6 - If an axon receives two stimuli close together in...Ch. 11.7 - Events at a chemical synapse usually involve...Ch. 11.7 - What structure joins two neurons at an electrical...Ch. 11.8 - Which ions flow through chemically gated channels...Ch. 11.8 - Prob. 19CYUCh. 11.9 - Prob. 20CYUCh. 11.9 - Why is cyclic AMP called a second messenger?Ch. 11.10 - Which types of neural circuits would give a...Ch. 11.10 - Prob. 23CYUCh. 11.10 - What pattern of neural processing occurs when we...Ch. 11 - Which of the following structures is not part of...Ch. 11 - Match the names of the supporting cells found in...Ch. 11 - Assume that an EPSP is being generated on the...Ch. 11 - Prob. 3MCCh. 11 - The velocity of nerve impulse conduction is...Ch. 11 - Chemical synapses are characterized by all of the...Ch. 11 - Biogenic amine neurotransmitters include all but...Ch. 11 - Prob. 8MCCh. 11 - Inhibition of acetylcholinesterase by poisoning...Ch. 11 - The anatomical region of a multipolar neuron where...Ch. 11 - An IPSP is inhibitory because (a) it...Ch. 11 - Identify the neuronal circuits described by...Ch. 11 - Explain both the anatomical and functional...Ch. 11 - (a) Describe the composition and function of the...Ch. 11 - (a) What is myelin? (b) How does the myelination...Ch. 11 - (a) Contrast unipolar, bipolar, and multipolar...Ch. 11 - What is the polarized membrane state? How is it...Ch. 11 - Describe the events that must occur to generate an...Ch. 11 - Prob. 19SAQCh. 11 - (a) Explain the difference between an EPSP and an...Ch. 11 - Since at any moment a neuron is likely to have...Ch. 11 - The effects of neurotransmitter binding are very...Ch. 11 - Prob. 23SAQCh. 11 - Prob. 24SAQCh. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...
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- what happens to the conduction velocity of an axon that is isometrically twice as big as another axon ?arrow_forwardMany neurons have only a single axon, but many terminals at the end of the axon. How does this end structure of the axon support its function?arrow_forwardIf the middle of an axon were depolarized to threshold, in which direction could the action potential propagate?arrow_forward
- Describe how following a threshold stimulus, a action potential is carried along an unmyelinated axon? How does this differ from an action potential passing through a mylenated axon?arrow_forwardHow might the disease multiple sclerosis affect transmission of action potentials along a myelinated neuron?arrow_forwardWhat are the two main factors that influence the conduction speed of an action potential along an axon?arrow_forward
- What ionic and electrical changes occur during passage of an action potential along an axon?arrow_forwardWhat happens at the nodes of Ranvier in a myelinated axon?arrow_forwardHow does myelin aid propagation of an action potential along an axon? How do the nodes of Ranvier help this process?arrow_forward
- Describe the propagation of an action potential. Contrast this eventin myelinated and unmyelinated axons?arrow_forwardIf an axon receives two stimuli close together in time, only one AP occurs. Why?arrow_forwardExplain why myelinated axons can propagate (spread) action potentials faster than unmyelinated axons.arrow_forward
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