Which of the following is not correct about myelin sheaths? Select one O A. They are formed by glial cells, namely ollgodendrocytes and Schwann cells. O B. They are fatty menmbranes, O.C. They are responsible for saltatory conduction, the process in which the action potentials jump between nodes of Ranvier OD. They insulate parts of the neuren axon but not the cell body and dendrites. OE. They increase the speed of action potential conduction along an axon by increasing the diamter of the axon.

Which of the following is not correct about myelin sheaths? Select one O A. They are formed by glial cells, namely ollgodendrocytes and Schwann cells. O B. They are fatty menmbranes, O.C. They are responsible for saltatory conduction, the process in which the action potentials jump between nodes of Ranvier OD. They insulate parts of the neuren axon but not the cell body and dendrites. OE. They increase the speed of action potential conduction along an axon by increasing the diamter of the axon.

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 4ILQ: View the University of Michigan Webscope (http://openstaxcollege.org/l/nervefiber) to see an...

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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?
Which of the following is not correct about myelin sheaths? Select one: O A. They insulate parts of the neuron axon but not the cell body and dendrites. O B. They are fatty membranes. O C. They are formed by glial cells, namely oligodendrocytes and Schwann cells. O D. They are responsible for saltatory conduction, the process in which the action potentials jump between nodes of Ranvier. O E. They increase the speed of action potential conduction along an axon by increasing the diamter of the axon.
Which of the following is not correct about myelin sheaths? Select one: O A They insulate parts of the neuron axon but not the cell body and dendrites. O B. They increase the speed of action potential Onduction along an axon by increasing the diamter of the axon. O C. They are formed by glial cells, namely oligodendrocytes and Schwann cells. O D. They are responsible for saltatory conduction, the process in which the action potentials jump.between nodes of Ranvier O E. They are fatty membranes.
Which of the following is (are) true about the myelin sheath? a. made of Schwann cells O b. allow for saltatory conduction O c. insulate the nerve cell O d. all of these
Many neurotransmitters trigger depolarisation by binding their receptors and gating an ion channel that allows Nat influx. What happens if a neurotransmitter such as GABA, binds its receptor, gating a chloride channel (CI)? Select the (one) CORRECT answer. O a. The neuron becomes depolarised. Ob. The membrane potential does not change O c. The neuron becomes hyperpolarised O d. The neuron fires an action potential
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
Choose the item in column 2 that best matches each item in column 1 nodes of Ranvier resting membrane potential axon dendrite myelin sheath synapse nerve A. neuronal cell extension that propagates action potentials away from the cell body B. discontinuous insulation of an axon C. bundle of axons…
Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
An on center bipolar cell ________ when light is on the center of its receptive feild, because it is _______ glutamate Select one: a. depolarizes; inhibited by b. hyperpolarizes; activated by c. depolarizes; activated by d. hyperpolarizes; inhibited by e. maintains its resting membrane potential; excited by
The following are characteristics of the myelin sheath EXCEPT: A formed by the oligodendrocytes in the CNS B lipid- rich C covers the body or dendrites of a neuron D insulates the axons
Damage to the axons in the spinal cord is typically permanent and debilitating. One promising avenue of treatment is transplanting certain cells into the spinal cord after injury. Which cell type is the best choice to help repair a severed axon? O a. Microglia O b. Inhibitory neurons Oc. Astrocytes O d. Schwann cells O e. Excitatory neurons O f. Oligodendrocytes
The following figure is showing; Node Node Myelin sheath Node of Ranvier (a) Na+ Na+ Depolarization Degenerated myelin sheath (b) Na* Current leak Na+ slows conduction O Both images above show damaged axons O The effects of the loss of myelination on an action potential Both images above show normal axons O Both images above show MS O None of these is correct