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the potential difference (voltage) across the membrane?

the potential difference (voltage) across the membrane?

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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c. Based on the picture, would you say this channel is most likely voltage-gated, ligand-gated, of mechanically gated? Support your answer with evidence from the picture and reasoning. d. What is the potential difference (voltage) across the membrane? e. With the channel open, what starts to happen? f. How would this change the voltage of the membrane over time? 19. Now look at Figure 3. a. What is different about this picture than Figure 2? b. What is the potential difference (voltage) across the membrane? C. What most likely caused this change in voltage? ROB010e 201 24250 10 700 agrioviel 063 IS d. Based on the picture, would you say the 2nd and 3rd channels are most likely voltage-gated, ligand-gated, or mechanically gated? Support your answer with evidence from the picture and reasoning. stog obus e. What will this do to the differences in charge across the membrane over time?
Transcribed Image Text:c. Based on the picture, would you say this channel is most likely voltage-gated, ligand-gated, of mechanically gated? Support your answer with evidence from the picture and reasoning. d. What is the potential difference (voltage) across the membrane? e. With the channel open, what starts to happen? f. How would this change the voltage of the membrane over time? 19. Now look at Figure 3. a. What is different about this picture than Figure 2? b. What is the potential difference (voltage) across the membrane? C. What most likely caused this change in voltage? ROB010e 201 24250 10 700 agrioviel 063 IS d. Based on the picture, would you say the 2nd and 3rd channels are most likely voltage-gated, ligand-gated, or mechanically gated? Support your answer with evidence from the picture and reasoning. stog obus e. What will this do to the differences in charge across the membrane over time?
1 READ: Proteins embedded in the cell membrane, like the ones pictured in Model 2, can act as ion channels to allow specific ions to cross the membrane. These channels can be voltage-gated, ligand-gated, or mechanically- gated. Voltage-gated channels open and close in response to changes in the membrane potential. Ligand-gated channels only open when a specific chemical (ligand), such as a neurotransmitter, binds to the channel. Mechanically gated channels only open if the membrane is stretched or physically deformed. The movement of ions through these types of channels is key to all electrical events in neurons, and thus to signal transmission. The movement of a few ions results in a graded potential, a short-lived, localized change in the membrane potential that can vary in strength. The movement of lots of ions, exceeding the threshold, can result in an action potential, a change in the membrane potential that is big enough to conduct a nerve impulse. +40 0 ill B с ibste A Voltage (mv) -70 -80 -90 -100 -ntrol and Coordination Unit 3 Time (ms) D 4 lo ino M b Extracellular, 1301/10 Intracellular A A Na O KA Milw beaybpal obia D Extracellular, Intracellular Na A OA A Intracellular Model 3 - Action Potential w O O KATdsm A 10028 It's Not Rocket Science 2019 O A Vagos aim of afhow gaug nastog ctuboe st Extracellular C DANH ΔΟ O A +35 mV 10
Transcribed Image Text:1 READ: Proteins embedded in the cell membrane, like the ones pictured in Model 2, can act as ion channels to allow specific ions to cross the membrane. These channels can be voltage-gated, ligand-gated, or mechanically- gated. Voltage-gated channels open and close in response to changes in the membrane potential. Ligand-gated channels only open when a specific chemical (ligand), such as a neurotransmitter, binds to the channel. Mechanically gated channels only open if the membrane is stretched or physically deformed. The movement of ions through these types of channels is key to all electrical events in neurons, and thus to signal transmission. The movement of a few ions results in a graded potential, a short-lived, localized change in the membrane potential that can vary in strength. The movement of lots of ions, exceeding the threshold, can result in an action potential, a change in the membrane potential that is big enough to conduct a nerve impulse. +40 0 ill B с ibste A Voltage (mv) -70 -80 -90 -100 -ntrol and Coordination Unit 3 Time (ms) D 4 lo ino M b Extracellular, 1301/10 Intracellular A A Na O KA Milw beaybpal obia D Extracellular, Intracellular Na A OA A Intracellular Model 3 - Action Potential w O O KATdsm A 10028 It's Not Rocket Science 2019 O A Vagos aim of afhow gaug nastog ctuboe st Extracellular C DANH ΔΟ O A +35 mV 10
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