2.A.1.2.3.4.||||ential (mv)13. State the channels involved in an action potential in cardiac AUTORHYTHMIC cells,which ion moves across the channel, which direction each ion moves across thechannel when the channel opens, the approximate membrane potential at which thechannel is fully open.+20!!|CE - |ChannelAaBbCcDdEe AaBbCcD. AaBBCEDE AalEmphasisHeading 1Normallon?Influx or Efflux?14. Define the term pacemaker potential (=drifting potential) and be able to identify itwhen given a graph of an action potential in an autorhythmic cell such as the onebelow.IMembrane Potential at whichchannel opens or is fully open (mv)

The heart is covered by a membrane called the pericardium. The cardiac muscle forms the inner…

13. State the channels involved in an action potential in cardiac AUTORHYTHMIC cells, which ion moves across the channel, which direction each ion moves across the channel when the channel opens, the approximate membrane potential at which the channel is fully open. 1. 2. 3. 4. Channel lon? Influx or Efflux? Membrane Potential at which channel opens or is fully open (mv)

13. State the channels involved in an action potential in cardiac AUTORHYTHMIC cells, which ion moves across the channel, which direction each ion moves across the channel when the channel opens, the approximate membrane potential at which the channel is fully open. 1. 2. 3. 4. Channel lon? Influx or Efflux? Membrane Potential at which channel opens or is fully open (mv)

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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Cardiomyocyte action potential 3 4 5 2 1 0.15 0.30 time (s) For our course, "regular" cardiocytes are cardiocytes that are NOT part of the SA node. Please use the word bank to complete the following statements: (choices can be used more than once, obviously) voltage-gated calcium channels voltage-gated sodium channels voltage-gated potassium channels stable not stable Unlike SA node cardiocytes, regular cardiocytes have a resting membrane potential that is Regular cardiocytes become stimulated when calcium and sodium pass fro neighboring excited cardiocytes through gap junctions (see 1). This causes to open, resulting in the regular cardiocytes to sharply depolarize (see 2). At 3, these channels close, and open, resulting in both depolarization and sarcomere contraction. Also at 3, open, causing the cell to repolarize. The opposing forces, (depolarization and repolarization) of the two channels that are open simultaneously, results in a plateau (see 4). This plateau continues until…
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