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21. During the generation of an action potential in a nerve cell axon, the depolarization of the membrane is caused by:T + a) opening of potassium channels in the axonal membraneT + b) opening of sodium channels in the axonal membrane T + c) closing of potassium channels in the axonal membraneT + d) closing of sodium channels in the axonal membrane.T 22. Myelinated axons:T + 'a) have gaps in the myelin sheath, in which the membrane is exposed, called Nodes of - Ranvier. T + b) propagate impulses more rapidly that unmyelinated axons due to saltatory conduction. + c) occur in white matter of the CNST d) can be destroyed by diseases such as multiple sclerosis (MS) and amvlotrophic lateral sclerosis (Lou Gehrig's disease) T + e) All of the above (a, b, c and d) are correct. T

21. During the generation of an action potential in a nerve cell axon, the depolarization of the membrane is caused by:T + a) opening of potassium channels in the axonal membraneT + b) opening of sodium channels in the axonal membrane T + c) closing of potassium channels in the axonal membraneT + d) closing of sodium channels in the axonal membrane.T 22. Myelinated axons:T + 'a) have gaps in the myelin sheath, in which the membrane is exposed, called Nodes of - Ranvier. T + b) propagate impulses more rapidly that unmyelinated axons due to saltatory conduction. + c) occur in white matter of the CNST d) can be destroyed by diseases such as multiple sclerosis (MS) and amvlotrophic lateral sclerosis (Lou Gehrig's disease) T + e) All of the above (a, b, c and d) are correct. T

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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please answer 21,22

21. During the generation of an action potential in a nerve cell axon, the depolarization of the membrane is caused by:T + a) opening of potassium channels in the axonal membraneT + b) opening of sodium channels in the axonal membraneT + c) closing of potassium channels in the axonal membraneT + d) closing of sodium channels in the axonal membrane. T 22. Myelinated axons: + 'a) have gaps in the myelin sheath, in which the membrane is exposed, called Nodes of - Ranvier. T + b) propagate impulses more rapidly that unmyelinated axons due to saltatory conduction. T + c) occur in white matter of the CNST + d) can be destroyed by diseases such as multiple sclerosis (MS) and amvlotrophic lateral sclerosis (Lou Gehrig's disease) T + e) All of the above (a, b, c and d) are correct. T
Transcribed Image Text:21. During the generation of an action potential in a nerve cell axon, the depolarization of the membrane is caused by:T + a) opening of potassium channels in the axonal membraneT + b) opening of sodium channels in the axonal membraneT + c) closing of potassium channels in the axonal membraneT + d) closing of sodium channels in the axonal membrane. T 22. Myelinated axons: + 'a) have gaps in the myelin sheath, in which the membrane is exposed, called Nodes of - Ranvier. T + b) propagate impulses more rapidly that unmyelinated axons due to saltatory conduction. T + c) occur in white matter of the CNST + d) can be destroyed by diseases such as multiple sclerosis (MS) and amvlotrophic lateral sclerosis (Lou Gehrig's disease) T + e) All of the above (a, b, c and d) are correct. T
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