The neuron resting potential diagram is confusing to me. For the supposed sodium potassium channel in purple, how come the sodium ions are going outside of the cell instead of inside? How is it that there is a higher potassium concentration inside of the cell at this time if there are more leaky potassium channels (which should be pumping the potassium ions outside)?

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
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The neuron resting potential diagram is confusing to me. For the supposed sodium potassium channel in purple, how come the sodium ions are going outside of the cell instead of inside? How is it that there is a higher potassium concentration inside of the cell at this time if there are more leaky potassium channels (which should be pumping the potassium ions outside)?

K+ leak
channel
Open
Na+/K+ pump
2 K+ in
(Α΄
T
+
+
+
3 Na+ out
T
I
+++
A
T
Voltage-gated
K+ channel
(closed)
++++++++
Anions (negatively charged
proteins, nucleic acids, and
other large molecules) that
cannot pass through
membrane
+++
+
A
A
Voltage-gated Axon plasma
Na+ channel membrane
(closed)
Na+
K+
A™
T
A
K+ Na+
+ + + + + + + + + +
A K+
T
+ + + + +
Inside
15
150
100
A
T
+
Na+
Charged Particle Concentrations (mm)
Outside
150
A
5
0
+ +
Axon
Brooks/Cole, Cengage Learning
Shown is the distribution of ions that produces a resting potential
(about-70mV)
Transcribed Image Text:K+ leak channel Open Na+/K+ pump 2 K+ in (Α΄ T + + + 3 Na+ out T I +++ A T Voltage-gated K+ channel (closed) ++++++++ Anions (negatively charged proteins, nucleic acids, and other large molecules) that cannot pass through membrane +++ + A A Voltage-gated Axon plasma Na+ channel membrane (closed) Na+ K+ A™ T A K+ Na+ + + + + + + + + + + A K+ T + + + + + Inside 15 150 100 A T + Na+ Charged Particle Concentrations (mm) Outside 150 A 5 0 + + Axon Brooks/Cole, Cengage Learning Shown is the distribution of ions that produces a resting potential (about-70mV)
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