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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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Consider this action potential drawn below.
23. What causes the depolarization of the membrane at A?
24. What causes the repolarization of the membrane at B?
25. Why does the membrane hyperpolarize at C?
26. What triggers gating of delayed K rectifying channels?
27. Explain what inactivation of the Na channel is and why it is important to A?
28. Explain how an action potential is propagated along an axon?
29. What prevents an action potential from reversing direction along an axon?
30. Explain how excitatory neurotransmitters generated an action potential
31. Explain how an inhibitory neurotransmitter can prevent the generation of an action potential.
32. Outline how an action potential in a nerve cell results in muscle contraction.
Membrane
potential
+40mV
A
-70mV
C
Time
B.
Transcribed Image Text:Consider this action potential drawn below. 23. What causes the depolarization of the membrane at A? 24. What causes the repolarization of the membrane at B? 25. Why does the membrane hyperpolarize at C? 26. What triggers gating of delayed K rectifying channels? 27. Explain what inactivation of the Na channel is and why it is important to A? 28. Explain how an action potential is propagated along an axon? 29. What prevents an action potential from reversing direction along an axon? 30. Explain how excitatory neurotransmitters generated an action potential 31. Explain how an inhibitory neurotransmitter can prevent the generation of an action potential. 32. Outline how an action potential in a nerve cell results in muscle contraction. Membrane potential +40mV A -70mV C Time B.
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