EBK ANATOMY & PHYSIOLOGY: THE UNITY OF
7th Edition
ISBN: 8220102796409
Author: SALADIN
Publisher: YUZU
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Chapter 12, Problem 7TYR
Summary Introduction
Introduction:
The nerve fiber is insulated by a spiral layer called myelin, which is produced in both CNS and PNS. This myelin sheath is absent in unmyelinated nerve cells. The myelinated cells conduct signals in a distinct manner known as saltatory conduction; saltatory means “jumping” or “leaping”. These myelinated fibers are unable to conduct the signal continuously.
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Action potentials are conducted more rapidlya. in small-diameter axons than in large-diameter axons.b. in unmyelinated axons than in myelinated axons.c. along axons that have nodes of Ranvier.d. All of these are correct.
Repolarization of an axon during an action potential is produced by a. inward diffusion of Na+. b. active extrusion of K+. c. outward diffusion of K+. d. inward active transport of Na+.
Which of the following is/are found only in the PNS?
a. Nerves
b. Astrocytes
c. Myelin
d. Lipofuscin
e. Unmyelinated axons
Chapter 12 Solutions
EBK ANATOMY & PHYSIOLOGY: THE UNITY OF
Ch. 12.1 - Prob. 1BYGOCh. 12.1 - Prob. 2BYGOCh. 12.1 - Prob. 3BYGOCh. 12.1 - Prob. 1AYLOCh. 12.1 - Prob. 2AYLOCh. 12.1 - Prob. 3AYLOCh. 12.1 - Prob. 4AYLOCh. 12.2 - Prob. 4BYGOCh. 12.2 - Prob. 5BYGOCh. 12.2 - Prob. 6BYGO
Ch. 12.2 - Prob. 7BYGOCh. 12.2 - Prob. 1AYLOCh. 12.2 - Prob. 2AYLOCh. 12.2 - Prob. 3AYLOCh. 12.2 - Prob. 4AYLOCh. 12.2 - Prob. 5AYLOCh. 12.3 - Prob. 8BYGOCh. 12.3 - Prob. 9BYGOCh. 12.3 - Prob. 10BYGOCh. 12.3 - Prob. 1AYLOCh. 12.3 - Prob. 2AYLOCh. 12.3 - Prob. 3AYLOCh. 12.3 - Prob. 4AYLOCh. 12.4 - Prob. 11BYGOCh. 12.4 - Prob. 12BYGOCh. 12.4 - Prob. 13BYGOCh. 12.4 - Prob. 14BYGOCh. 12.4 - Prob. 15BYGOCh. 12.4 - Prob. 16BYGOCh. 12.4 - Prob. 17BYGOCh. 12.4 - Prob. 1AYLOCh. 12.4 - Prob. 2AYLOCh. 12.4 - Prob. 3AYLOCh. 12.4 - Prob. 4AYLOCh. 12.4 - Prob. 5AYLOCh. 12.4 - Prob. 6AYLOCh. 12.4 - Prob. 7AYLOCh. 12.4 - Prob. 8AYLOCh. 12.4 - Prob. 9AYLOCh. 12.5 - Prob. 18BYGOCh. 12.5 - Prob. 19BYGOCh. 12.5 - Prob. 20BYGOCh. 12.5 - Prob. 21BYGOCh. 12.5 - Prob. 1AYLOCh. 12.5 - Prob. 2AYLOCh. 12.5 - Prob. 3AYLOCh. 12.5 - Prob. 4AYLOCh. 12.5 - Prob. 5AYLOCh. 12.5 - Prob. 6AYLOCh. 12.5 - Prob. 7AYLOCh. 12.5 - Prob. 8AYLOCh. 12.5 - Prob. 9AYLOCh. 12.6 - Prob. 22BYGOCh. 12.6 - Prob. 23BYGOCh. 12.6 - Prob. 24BYGOCh. 12.6 - Prob. 25BYGOCh. 12.6 - Prob. 1AYLOCh. 12.6 - Prob. 2AYLOCh. 12.6 - Prob. 3AYLOCh. 12.6 - Prob. 4AYLOCh. 12.6 - Prob. 5AYLOCh. 12.6 - Prob. 6AYLOCh. 12.6 - Prob. 7AYLOCh. 12.6 - Prob. 8AYLOCh. 12.6 - Prob. 9AYLOCh. 12.6 - Prob. 10AYLOCh. 12.6 - Prob. 11AYLOCh. 12.6 - Prob. 12AYLOCh. 12.6 - Prob. 13AYLOCh. 12.6 - Prob. 14AYLOCh. 12 - The integrative functions of the nervous system...Ch. 12 - The highest density of voltage-gated ion channels...Ch. 12 - The soma of a mature neuron lacks a. a nucleus. b....Ch. 12 - The glial cells that fight infections in the CNS...Ch. 12 - Posttetanic potentiation of a synapse increases...Ch. 12 - An IPSP is_____of the postsynaptic neuron. a. a...Ch. 12 - Prob. 7TYRCh. 12 - Prob. 8TYRCh. 12 - Prob. 9TYRCh. 12 - Prob. 10TYRCh. 12 - Prob. 11TYRCh. 12 - Prob. 12TYRCh. 12 - Prob. 13TYRCh. 12 - Prob. 14TYRCh. 12 - Prob. 15TYRCh. 12 - A myelinated nerve fiber can produce action...Ch. 12 - Prob. 17TYRCh. 12 - Prob. 18TYRCh. 12 - Prob. 19TYRCh. 12 - Prob. 20TYRCh. 12 - Prob. 1BYMVCh. 12 - Prob. 2BYMVCh. 12 - Prob. 3BYMVCh. 12 - Prob. 4BYMVCh. 12 - Prob. 5BYMVCh. 12 - Prob. 6BYMVCh. 12 - Prob. 7BYMVCh. 12 - Prob. 8BYMVCh. 12 - Prob. 9BYMVCh. 12 - Prob. 10BYMVCh. 12 - Prob. 1TFCh. 12 - Prob. 2TFCh. 12 - Prob. 3TFCh. 12 - Prob. 4TFCh. 12 - Excitatory postsynaptic potentials lower the...Ch. 12 - Prob. 6TFCh. 12 - Prob. 7TFCh. 12 - Myelinated nerve fibers conduct signals more...Ch. 12 - Prob. 9TFCh. 12 - Prob. 10TFCh. 12 - Schizophrenia is sometimes treated with drugs such...Ch. 12 - Hyperkalemia is an excess of potassium ill the...Ch. 12 - Suppose a poison were to slow down the Na+-K+...Ch. 12 - Prob. 4TYCCh. 12 - Prob. 5TYC
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Action potential conduction velocity is more rapid in a myelinated axon than an unmyelinated one because in a myelinated axon: a. the action potential travels as a continuous wave. b. there is a decrease in membrane resistance. c. the action potential jumps along the axon. d. there is an increase in membrane capacitance. e. there is an increase in the ion gradients.arrow_forwardUsing cable theory to describe axon conduction would tell us a. the larger the diameter of the axon the faster the propagation of the action potential b. the larger the diameter of the axon the slower the propagation of the action potential c. the smaller the diameter of the axon the faster the propagation of the action potential d. that having big axons is of no benefit and only takes up a lot of space e. the nervous system mainly has small axons because they are much faster than large onesarrow_forwardThe two primary factors that influence the speed of an action potential propagation are axon diameter and a. myelination. b. the type of associated glial cell(s). c. concentration of K+ in the cell. d. the length of the axon.arrow_forward
- The rate of information transmission from the central nervous system (CNS) to an effector organ will be slowed by... A. increasing the diameter of the axons B. increasing the number of nerve cells between the CNS and the effector organ C. adding a myelin sheath to the axons D. increasing the distance between the nodes of Ranvier E. None of the abovearrow_forwardThe axons of myelinated neurons are imbedded in a protective covering of A. Schwann cells B. gray matter. C. nodes of Ranvier D. synaptic knobs.arrow_forwardAction potentials are normally initiated at the axon hillock because a. there is a particularly high density of voltage-gated sodium channels there. b. threshold potential is lower there than at other sites along the plasma membrane. c. activation of sodium channels at the axon hillock results in a particularly strong inward current and consequent depolarization. d. all of these. e. none of these.arrow_forward
- The Na+/K+ ATPase pump is a. not required for action potential firing. b. important for long-term maintenance of resting potential. c. important only at the synapse. d. used to stimulate graded potentials.arrow_forwardDuring a typical action potential in a nerve, which of the following is happening? Multiple choices A. Voltage gated K+ channels are allowing for influx of potassium B. All of these are happening C. Na/K pumps are pumping Na+ in and K+ out D. Voltage gated Na+ channels are allowing for efflux of sodium E. Leak K+ current, with K+ exiting the nervearrow_forwardWhich of the following is/are found only in the PNS? a. Nerves b. Astrocytes с. Мyelin d. Lipofuscin e. Unmyelinated axonsarrow_forward
- An inhibitory presynaptic neuron can affect a postsynaptic neuron bya. producing an IPSP in the postsynaptic neuron.b. hyperpolarizing the plasma membrane of the postsynaptic neuron.arrow_forwardIn which of these fibers the action potential reaches the axon terminal faster: Select one: O a. A warm fiber in which the action potential performs a saltatory conduction O b. A non-myelinated fiber OC.A fiber in which the action potential performs a continuous conduction d. A cold myelinated fiberarrow_forwardThe junction between the axon of one cell and the dendrite of another is calleda. neurilemma.b. myelin.c. synaptic cleft.d. nodes of Ranvier.arrow_forward
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