Using 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 ones

Using 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 ones

Anatomy & Physiology

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter12: The Nervous System And Nervous Tissue

Section: Chapter Questions

Problem 8ILQ: Watch this video (http://openstaxcollege.org/l/neurotrans) to learn about the release of a...

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View the University of Michigan Webscope (http://openstaxcollege.org/l/nervefiber) to see an electron micrograph of a cross-section of a myelinated nerve fiber. The axon contains microtubules and neurofilaments, bounded by a plasma membrane known as the axolemma. Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. What aspects of the cells in this image react with the stain that makes them the deep, dark, black color, such as the multiple layers that are the myelin sheath?
In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.
Which of the following would increase the speed of a nerve impulse along an axon?A. Decreasing the spacing between the nodes of the axonB. Decreasing the resistance between nodesC. Decreasing the thickness of the myelin sheathD. Increasing the resting potential of the axon
You have bunch of neurons in alive in a dish. You are recording from the axon hillock of one neuron while you stimulate an action potential in another neuron that synapses on the neuron you are recording from. One action potential from your presynaptic neuron causes +5 mV depolarization in the postsynaptic neuron’s axon hillock. Threshold for this neuron requires +10 mV. How can you most assuredly achieve threshold for this post-synaptic neuron? Group of answer choices Firing the presynaptic neuron multiple times in close succession Firing the presynaptic neuron plus another random presynaptic neuron that you find in the dish You can’t a +5mV EPSP will never be able to reach a 10mV threshold Firing the presynaptic neuron multiple times but keep the firing events spaced out really far in time.
In the dark, bipolar cells are O inactive due to open Cl- channels active due to open Na+ channels inactive due to closed Ca++ channels active due to open Ca++ channels
What characteristic distinguishes dendrites from axons?a. Presence of branches at the tipsb. Direction of impulse transmission relative to cell bodyc. Whether they direct impulses toward or away from the braind. Presence of sodium channels in the cell membrane
The giant squid axon has a diameter = 1mm and 1 = 13mm. Compared to a mammalian neuron with a diameter = 1 um and ^ = 0.2mm, which of the following is correct? graded potentials can generate action potentials in the mammalian axon but not in the squid axon. graded potential of similar magnitude would result in action potentials with larger amplitude in the mammalian axon graded potentials of similar magnitude would result in action potentials with larger amplitude in the squid axon graded potentials of similar magnitude would travel furthest from their point of origin in the mammalian axon graded potentials of similar magnitude would travel furthest from their point of origin in the squid axon
At the membrane of an axón, the action potential is -60 mV for K+ ions. Calculate de external and internal concentration radios.
The absolute refractory period of an action potentialA. only ensures one-way travel down an axon.B. only allows a neuron to ignore a second signal sent that closely follows the first.C. only prevents summation of action potentials within the axonD. ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the firstE. ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials within the axon
In neurons, the direction of signal is always: Up axon to soma (cell body) Down soma (cell body) to dendrites O Up soma (cell body) to dendrites SEP O Down axon terminal to dendrites O Down axon towards axon terminal
Which is not true about axons? They arise from the cell body they send information to other cells they contain dendritic spines they recive information from other cells
An individual diagnosed with CMT has difficulty holding a cup because: a. The myelin in the motor neurons is damaged thereby preventing an impulse frommoving along the axonb. The myelin in the sensory neurons is damaged thereby preventing an impulse frommoving along the axonc. The dendrites in the motor neurons are damaged thereby preventing an impulse frommoving along the axond. The dendrites in the sensory neurons are damaged thereby preventing an impulse frommoving along the axon